ROUSH F-150 Operating manual

2007.5 - 2008
Ford F-150
LIQUID PROPANE INJECTION
Rev. 12/14/2010
SERVICE MANUAL SUPPLEMENT

Current as of 12-14-2010
ROUSH® CleanTech F-150 Liquid Propane Injection
Service Manual Supplement
FOREWORD
This manual is a supplement to the Ford F-150 Workshop Manuals (referenced as the “Ford
WSM” where applicable in this manual). It is intended to provide technicians with the
procedures required to maintain and service the unique components of the ROUSH CleanTech
F-150 Liquid Propane Injection vehicles. Service procedures for vehicle components shared in
common with Ford F-150 vehicles will be referenced to and covered in the Ford Workshop
Manual.
This manual supplement includes a Table of Contents to direct you to the information
contained within. LIMITED LIABILITY DISCLAIMER
The information in this publication was accurate and effective at the time the publication was
approved for printing and is subject to change without notice or liability. ROUSH CleanTech
reserves the right to revise the information herein and to make changes and discontinue
production of described parts at any time.
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TABLE OF CONTENTS
FOREWORD............................................................................................................i
LIMITED LIABILITY DISCLAIMER.........................................................................i
INTRODUCTION.....................................................................................................1
General Information...........................................................................................1
ROUSH CleanTech Technical Assistance...................................................................... 1
Start Sequence ................................................................................................................. 1
Fill Stations....................................................................................................................... 1
Range and Fuel Economy................................................................................................ 2
Safety Information .............................................................................................2
Alert Messages................................................................................................................. 2
Installation, Garaging and Training.................................................................3
Purging and Venting (Tanks and Lines)..........................................................3
VEHICLE INFORMATION......................................................................................4
Build Data ...........................................................................................................4
Vehicle Emissions Control Information (VECI) Labels.................................................. 4
VECI Label Location......................................................................................................... 5
DESCRIPTION AND OPERATION........................................................................6
System Overview...............................................................................................6
Vehicle Starting ................................................................................................................7
System Components and Function.................................................................8
Fuel Rails and Injectors................................................................................................... 8
Flow Control Solenoid (FCS)........................................................................................... 8
Injection Pressure and Temperature Sensor (IPTS)...................................................... 9
Fuel Supply and Return Lines......................................................................................... 9
Fuel Tanks....................................................................................................................... 10
Multivalve........................................................................................................................ 11
FUEL LEVEL SENDING UNIT.............................................................................................................. 12
Fuel Filler Valve and Fill Line ........................................................................................ 12
FILL VALVE ......................................................................................................................................... 12
IN-LINE FILTER.................................................................................................................................... 12
Glossary............................................................................................................13
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COMPONENT LOCATOR....................................................................................15
Engine Compartment ......................................................................................15
Fuel Rails and Injectors................................................................................................. 15
Chassis .............................................................................................................16
Fuel Lines and Tanks..................................................................................................... 16
TROUBLESHOOTING .........................................................................................17
Symptom Tables..............................................................................................17
Fuel Odor......................................................................................................................... 17
Diagnostic Flow Charts...................................................................................18
No Fill Condition............................................................................................................. 18
Slow Fill Condition......................................................................................................... 24
No Start Condition.......................................................................................................... 26
Fuel Pump Diagnostics.................................................................................................. 27
Fuel Sending Unit Diagnostics...................................................................................... 33
Fuel Fill Table.................................................................................................................. 36
MAINTENANCE REQUIREMENTS.....................................................................37
Schedule...........................................................................................................37
Maintenance Procedures ................................................................................37
Intake Air Filter Inspection............................................................................................. 37
In-Line Fuel Filter Replacement .................................................................................... 38
REPAIR PROCEDURES......................................................................................39
Preparing Vehicle for Service.........................................................................39
Alert Messages............................................................................................................... 39
Changing Fuses.............................................................................................................. 40
Pressure Relief ............................................................................................................... 41
Purging............................................................................................................................ 41
Purging the Fuel Tank.................................................................................................... 41
Purging System Fuel Lines............................................................................................ 41
Manual Fuel Shutoff ....................................................................................................... 42
Opening Manual Shutoff Valve...................................................................................... 43
Removing Intake Airbox Cover ..................................................................................... 44
Removing Power Steering Fluid Reservoir.................................................................. 45
Installing Power Steering Fluid Reservoir.................................................................... 46
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Installing Intake Airbox Cover....................................................................................... 46
Fuel System Component Removal Procedures ...........................................47
Removing Pressure Relief Hose ................................................................................... 47
Removing Flow Control Solenoid................................................................................. 48
Removing Fuel Lines (In-Bed Tank to Solenoid)......................................................... 48
Removing Fuel Lines (Under-Vehicle Toroidal Tank to Solenoid)............................. 49
Removing Fuel Lines (Solenoid to Engine).................................................................. 49
Removing Fuel Fill Line (Filter to Tank)........................................................................ 50
Removing Fuel Filler Neck............................................................................................. 51
Removing Fuel Filter Assembly .................................................................................... 52
Removing Fuel Fill Line (Neck to Filter) ....................................................................... 52
Removing Left (Driver’s Side) Fuel Rail........................................................................ 53
Removing Right (Passenger’s Side) Fuel Rail............................................................. 54
Removing Fuel Injector.................................................................................................. 55
Removing Injection Pressure and Temperature Sensor............................................. 56
Fuel Tank Removal Procedures.....................................................................57
Purging Fuel Tank.......................................................................................................... 57
Removing In-Bed Tank................................................................................................... 57
Removing Under-Vehicle Toroidal Tank....................................................................... 60
Fuel Tank Installation Procedures.................................................................66
LPG System Bleed and Fill Procedure ......................................................................... 66
Installing Under-Vehicle Toroidal Tank ........................................................................ 67
Installing In-Bed Tank .................................................................................................... 72
Fuel System Component Installation Procedures .......................................77
Before Installing Components....................................................................................... 77
Installing Injection Pressure and Temperature Sensor............................................... 78
Installing Fuel Injector ................................................................................................... 78
Installing Right (Passenger’s Side) Fuel Rail............................................................... 78
Installing Left (Driver’s Side) Fuel Rail......................................................................... 79
Installing Fuel Filter Assembly...................................................................................... 81
Installing Fuel Filler Neck .............................................................................................. 81
Installing Fuel Fill Line (Filler Neck to Filter) ............................................................... 83
Installing Fuel Fill Line (Fuel Filter to Tank)................................................................. 83
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Installing Fuel Lines (Solenoid to Engine) ................................................................... 84
Installing Fuel Lines (Under-Vehicle Tank to Solenoid).............................................. 84
Installing Fuel Lines (In-Bed Tank to Solenoid)........................................................... 85
Installing Flow Control Solenoid................................................................................... 85
Installing Pressure Relief Hose..................................................................................... 86
SPECIFICATIONS................................................................................................87
Engine Specifications .....................................................................................87
ROUSH CleanTech Conversion Ford 5.4L LPI Engine ................................................ 87
Chassis Specifications....................................................................................87
Fastener Torque Values..................................................................................88
SCHEMATICS ......................................................................................................90
Fuel System Flow Diagrams...........................................................................90
Fuel Flow......................................................................................................................... 90
Electrical Wiring Diagram...............................................................................91
Wiring Schematic ........................................................................................................... 91
Vehicle Harness.............................................................................................................. 92
In-Tank Wire Harness..................................................................................................... 93
TOOLS AND EQUIPMENT ..................................................................................94
Special Tools....................................................................................................94
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INTRODUCTION
General Information
This manual applies to the following ROUSH CleanTech Liquid Propane Injection applications:
•2007.5–2008 F-150 5.4L-3V
This manual is a supplement to the regular Ford Workshop Manual, covering the unique
components of the ROUSH CleanTech Liquid Propane Injection system:
•Fuel supply line
•Fuel return line
•Flow Control Solenoid (FCS)
•Fuel rails
•Fuel filler lines, valve and filter
•Fuel tank
The ROUSH CleanTech parts generally serve the same functions as the Ford parts they
replace.
The online Ford Workshop Manual, if available, continues to apply to all other details. The
diagnostic chart in this manual directs the technician to appropriate sections of the Ford
manual for applicable remedies in some situations.
Propane, like other fuels, must be handled safely with knowledge of its characteristics. Training
in propane characteristics and handling is available through the Propane Education and
Research Council (PERC), 1140 Connecticut Avenue, Washington, DC 20036. Their web
address is www.propanecouncil.org.
ROUSH CleanTech Technical Assistance
Call ROUSH CleanTech customer service at 800.59.ROUSH with any questions regarding
ROUSH CleanTech Liquid Propane Injection systems.
Start Sequence
The ROUSH CleanTech Liquid Propane Injection system is fully integrated with Ford’s One
Touch Starting system. The vehicle operator turns the key to the Start position and releases it.
The computer senses the pressure/temperature in the fuel lines and starts the fuel pump. The
pump sends liquid propane through the lines driving the vapor back to the tank to become
liquid again. When the pressure/temperature sensor reports that the lines are full of liquid, the
computer energizes the starter and the ignition system. The entire sequence generally takes
from 1.5 to 10 seconds (may extend to 20 seconds under extreme ambient conditions).
Fill Stations
Propane is readily available anywhere in the United States. To locate the nearest station,
check with http://www.afdc.energy.gov/afdc/locator/stations/.
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ROUSH CleanTech recommends facilities designed for automotive refueling. Other locations
may have low output pumps, resulting in slow or no fill, or low quality fuel which can result in
premature component failure.
Range and Fuel Economy
Propane contains less energy per unit volume then gasoline. Therefore, customers will
generally experience fuel economy (mile per gallon) 15–30% lower than gasoline.
Vehicle range will vary based on driving conditions and loading.
Safety Information
The National Fire Protection Association (NFPA) publishes a code book of rules that apply to
the storage, handling, transportation, and use of liquefied petroleum gas (LP-Gas or LPG). The
book is known as NFPA 58. It is revised as necessary and published every other year. This
code is adopted as law in virtually every political subdivision in the United States. Check with
your local authorities for regulations applicable to liquid propane.
Alert Messages
The following alert messages appear from time to time inappropriate places in this manual.
Ensure that all personnel in the immediate area are aware of these reminders.
Danger: Although propane is nontoxic, nonpoisonous, has the lowest flammability range of
any alternative fuel and dissipates quickly when released into the atmosphere, propane vapor
is heavier than air and seeks the lowest point. When the ratio of propane to air is between
2.2% and 9.6%, propane will burn in the presence of an ignition source at 940°F (504°C) or
hotter. Keep away from heat, sparks, flames, static electricity or other sources of ignition.
Failure to heed this danger may result in severe personal injury or death.
Danger: The fuel supply lines remain pressurized after engine shutdown. Keep away from
heat, sparks, flames, static electricity or other sources of ignition. Do NOT enter storage areas
or confined space unless they are adequately ventilated. Failure to heed this danger may
result in severe personal injury or death.
Danger: Do NOT carry lighted smoking materials or smoke while working on fuel system
components. Failure
to heed this danger could result in severe personal injury or death.
Danger: Disconnect the battery ground at the battery to ensure that the vehicle electrical
system has no current. Failure to heed this danger could result in severe personal injury or
death.
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Installation, Garaging and Training
Chapter 11 of NFPA 58 applies to engine fuel systems using LP-Gas in internal combustion
engines, including containers, container appurtenances, carburetion equipment, piping, hose
and fittings and their installation. Additionally, this chapter applies to garaging of vehicles and
to the training of personnel.
Paragraph 11.2 specifies that each person engaged in installing, repairing, filling or otherwise
servicing an LP-Gas engine fuel system shall be trained. Contact the Propane Education and
Research Council to learn more about their CETP E-Learning computer-based training
program: [e-mail], or [e-mail].
Purging and Venting (Tanks and Lines)
Venting of LP-Gas to the atmosphere is covered by paragraphs 7.3.1, General, and 7.3.2,
Purging of NFPA 58, 2008 edition. Refer to NFPA 58, Local Codes and Proper Training for
specific information relating to safe venting of LPG.
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VEHICLE INFORMATION
Build Data
ROUSH CleanTech emissions certification information is recorded on the ROUSH CleanTech
Vehicle Emissions Control Information (VECI) label. The label is vehicle-specific and is
required by law to be on the vehicle to which it is assigned along with the Ford VECI label.
Vehicle Emissions Control Information (VECI) Labels
Figure 1 — ROUSH CleanTech VECI Label (Typical)
Figure 2 — Ford VECI Label (Typical)
S
S
S
A
A
A
M
M
MP
P
PL
L
LE
E
E
S
S
S
A
A
A
M
M
MP
P
PL
L
LE
E
E
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VECI Label Location
The ROUSH CleanTech VECI label appears along with the original Ford VECI label in the
following location:
•F-150 — under hood at front, driver side
Figure 3 — VECI Label Location
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DESCRIPTION AND OPERATION
System Overview
The ROUSH CleanTech Liquid Propane Injection (LPI) system consists of a propane fuel tank,
fuel pump, fuel rails and lines, injectors and electronic controls. The system is simple and
easily serviced with no user adjustment required.
Figure 4 — LPI Fuel System (Typical)
Propane is stored in the vehicle fuel tank under pressure as a liquid. The pressure in the tank
is determined by the temperature of the fuel, ranging from 0 psi at minus 44°F, to 312 psi at
145°F. The tank has an overpressure safety device which vents the tank at pressures over 312
psi.
There are two propane filters in the system. The primary filter is located in the fuel fill line
which is intended to filter out the majority of contaminants that may be present in the fuel. The
primary filter must be replaced every 50,000 miles. A secondary fuel filter is located after the
fuel pump inside the tank which is intended to ensure that no contaminants reach the fuel
injectors.
ROUSH CleanTech LPI vehicles require HD-5 propane, rated for automotive use. Use of HD-
10 or other substandard propane may result in excess contamination of the system and failure
of the fuel pump, injectors and in-tank filter.
A pump inside the tank delivers liquid propane to the injectors through the fuel supply line and
the fuel rails. Excess fuel flows back to the tank through the fuel return line. Fuel pressure is
regulated by the Flow Control Solenoid (FCS) which includes a small orifice to restrict return
flow in normal conditions; and a bypass circuit to allow maximum fuel flow prior to engine
starting or during extremely hot conditions. The FCS is a separate component in F-150
applications and is located on the frame side rail in the fuel return line.
In order to safely store pressurized liquid propane in the vehicle, the fill system must ensure
that the tank is not filled beyond 80% of its total volume. This ensures that sufficient expansion
volume is present in case of significant tank temperature changes.
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The fuel fill system includes the following components:
1. Fuel fill valve, cap and mounting bracket
2. Fuel fill hoses
3. Fuel fill filter
4. Fuel tank internal components
a. Fuel fill solenoid
b. Fill pressure switch
c. 80% level sensor
During a fill event, the system functions as follows:
1. Customer connects fuel filler nozzle to fill valve and activates the fuel pump.
2. Fuel pressure in the fill line causes the pressure switch to close. In order for the switch
to close, pressure in the fill line must be at least 10 psi higher than tank pressure,
otherwise no fill is possible.
3. The fill pressure switch provides a ground to the 80% level sensor to activate the circuit.
If the fuel level is below the 80% level, the sensor provides ground to the fuel fill
solenoid, allowing fuel to enter the tank.
4. Once the fuel reaches the 80% fill level, the 80% level sensor de-activates, causing the
fill solenoid to close.
Note — Some fuel pumps may have sufficient pressure to allow a small fuel flow into
the tank even with the fill solenoid closed. The operator should stop the fill as soon the
fuel flow drops noticeably.
Vehicle Starting
The ROUSH CleanTech LPI system is fully integrated using Ford’s One Touch Integrated Start
(OTIS) system. When the ignition key is turned to crank and released to the On position, the
PCM opens the Flow Control Solenoid (FCS) and engages the fuel pump. As soon as the fuel
rail temperature and pressure are acceptable to ensure liquid fuel at the injectors, the starter
engages and the vehicle starts with no further action required from the operator. This delay
period is usually less than 5 seconds, but may be up to 30 seconds in extremely hot
conditions. During the delay period, the wrench light on the dash blinks to signal that the
system is active.
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System Components and Function
Fuel Rails and Injectors
The Ford OEM fuel rails and injectors are replaced with ROUSH CleanTech LPI fuel rail and
injector assemblies, including injection pressure and temperature sensor (IPTS), Schrader port
for service and crossover fuel line.
Figure 5 — Fuel Rails and Injectors
Flow Control Solenoid (FCS)
On F-Series vehicles a Flow Control Solenoid (FCS) is used to control fuel flow through the
fuel rails. The FCS is installed in the fuel return line and mounted on the left frame side rail in
the under-cab area.
Figure 6 — Flow Control Solenoid
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Injection Pressure and Temperature Sensor (IPTS)
The IPTS is used to monitor fuel pressure and temperature. On F-150 applications the IPTS is
read directly by the PCM.
Figure 7 — Injection Pressure and Temperature Sensor
Fuel Supply and Return Lines
The Ford OEM fuel lines are replaced with formed stainless steel lines following the original
production line routings. The formed lines are produced in many lengths and configurations to
accommodate the various vehicle models. The lines may be installed with two or three
sectioned assemblies depending on the specific vehicle model. All sections, supply and return,
include unions as part of the assembly.
The stainless steel fuel lines are retained in the chassis using the Ford OEM retention clips.
For position only – need representative illustration
Figure 8 — Stainless Fuel Supply and Return Lines (Typical)
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Fuel Tanks
Different tank configurations are used based on the vehicle model. A toroidal (doughnut
shaped) tank mounted under vehicle is available for the F-150 LPI vehicle. Optional on F-150
models is a large-diameter cylindrical tank mounted in the pickup bed. The in-bed tank with its
greater fuel capacity provides extended range.
Figure 9 — Fuel Tanks, Under-Vehicle Toroidal and In-Bed Configurations
All ROUSH CleanTech LPI vehicle fuel tanks regardless of configuration are fitted with the
same valve assemblies and control units. These include the Multivalve assembly, Fuel Control
Solenoid, Fuel Fill Solenoid, 80% Level Sensor, Fill Pressure Switch and the Fuel Level
Sending Unit.
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Multivalve
Overpressure Relief
Fuel Return Fuel Supply to Engine
Supply Solenoid
Manual Shutoff
Wiring Pass-Through
Fuel Fill
Figure 10 — Multivalve Assembly
The Multivalve attaches directly to the fuel tank and serves as the main interface between fuel
tank and vehicle. As the name implies, the Multivalve consists of a number of valves
incorporated into one unit. The included valves are:
Fill Valve — Located where fuel enters into the fuel tank, the fill valve is opened electrically
by the Fuel Fill Solenoid during the fill process. It also incorporates double back redundant
check valves which close when vehicle tank pressure is greater than pressure outside of
tank to prevent fuel from escaping.
Manual Shutoff Valve — This manually-operated valve is used to seal the outlet of the
tank during shipping or service. It should always be open when the vehicle is operating.
Excess Flow Valve —The excess flow valve is located in the supply fuel path. The valve
is intended to shut off fuel flow from the tank in case the supply line comes off of the tank. If
the excess flow valve trips (may happen after servicing the system), it can be reset by
closing the manual shutoff valve and then slowly opening it.
Pressure Relief Valve — When conditions cause tank pressure to rise to 312 psi, this
valve automatically opens to relieve the excessive pressure inside of the vehicle fuel tank.
Propane vapor is vented out of the pressure relief hose.
Fuel Supply Valve — The fuel supply valve is controlled by the PCM and is activated
whenever power is supplied to the fuel pump.
Fuel Return Check Valve — The fuel return line is protected by a check valve in the
Multivalve which prevents fuel from flowing from the tank into the return line.
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FUEL LEVEL SENDING UNIT
The Fuel Level Sending Unit is located inside of the fuel tank and consists of a float on an arm
with a wound resistor. The sending unit resistance is used by the instrument cluster to indicate
fuel level and by the PCM. It is not used in the fill system.
Fuel Filler Valve and Fill Line
The fuel fill line includes the fuel port with fill valve, the fill line hose and a filter.
Figure 11 — Fuel Filler Neck and Fill Line
FILL VALVE
The Fill Valve serves as the fuel fill inlet to the vehicle fuel tank. This is where the fill station
hose attaches while fueling and the fuel cap attaches during vehicle operation. It is a one way
single back check valve that opens during the fuel fill process and closes when fueling is
complete, to minimize fuel from escaping.
IN-LINE FILTER
The fuel filter is located in the fuel fill line to filter fuel from the fill station before it enters the
vehicle fuel tank. The filter is field serviceable and should be replaced every 50,000 miles.
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Glossary
80% Level Sensor — An infrared sensor designed to detect the presence of liquid. The
sensor is located inside the vehicle fuel tank at the 80% full level.
Bleed Solenoid —Closed when the engine is running, sealing the fuel rail from the vehicle
EVAP system. After the engine is turned off for approximately one hour, the Bleed Solenoid
opens for a calibrated length of time allowing pressure to bleed from the fuel rails. When
pressure is fully bled off, the solenoid closes, preventing fuel from entering the EVAP system.
The bleed solenoid is located in the FRPCM.
Fill Pressure Switch — A normally open pressure sensing switch. The switch is attached to
the Multivalve, internal to the vehicle fuel tank and used to sense pressure of the fuel coming
into the vehicle fuel tank from the fill station.
Fill Valve — Located where fuel enters into the vehicle fuel tank. During the fill process, the
valve is opened electrically by the Fuel Fill Solenoid. The valve also incorporates double back
redundant check valves that close when vehicle fuel tank pressure is greater than the pressure
outside of the tank to prevent fuel from escaping. The valve is part of the Multivalve.
Fuel Control Solenoid — Closed when the engine is running, but still allows fuel to flow
through a metered orifice back to the vehicle fuel tank. The solenoid is opened for
approximately 15 seconds after the engine is turned off to allow pressure in the fuel rails to
return to the vehicle fuel tank. The solenoid may also be opened to flush the fuel rails to
ensure that there is liquid fuel in the fuel rails during hot operating conditions. On F-Series
vehicles, the solenoid is a separate unit mounted on the frame rail in the return fuel line.
Fuel Fill Filter — In-line between the Fill Valve and the fuel tank to filter fuel before entering
the vehicle fuel tank during the fill process.
Fuel Fill Solenoid — Electrically-operated solenoid used to allow fuel to enter the vehicle fuel
tank during fills. The solenoid is located inside of the vehicle fuel tank and is attached to the
Multivalve.
Fuel Level Sending Unit — Located inside of the vehicle fuel tank to indicate fuel level. The
unit consists of a float on an arm with a wound resistor.
Fuel Rail Pressure Control Module (FRPCM) — Module consisting of four normally closed
solenoids controlled by a separate electronic control module. The FRPCM is mounted on the
engine. The module is used only in E-Series vehicles.
Fuel Return Check Valve — Ensures fuel does not escape from vehicle tank if there is a leak
in the fuel return line external to the tank. The valve is part of the Multivalve.
Fuel Supply Valve — Opened electrically by the Fuel Control Solenoid to provide fuel to the
engine. Also incorporates an excess flow control valve to minimize fuel escaping if there is a
leak in the fuel supply line external to the tank. The valve is part of the Multivalve.
Injector Pressure and Temperature Sensor (IPTS) — Mounted on the fuel rail, the IPTS is
used to monitor pressure and temperature of the fuel.
Manual Shutoff Valve — Manually operated valve that is used to seal the outlet of the vehicle
fuel tank during shipping or service. The valve should always be open when the vehicle is
operating. The valve is part of the Multivalve.
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Multivalve — Mounted directly on the vehicle fuel tank and serves as the main interface
between fuel tank and vehicle. The Multivalve consists of five valves incorporated into one unit
which includes the Fill Valve, the Manual Shutoff Valve, the Pressure Relief Valve, the Fuel
Supply Valve and the Fuel Return Check Valve. Also attached to, but not part of the Multivalve,
are the Fill Pressure Switch and the Fill Control Solenoid which are both internal to the tank.
Pressure Relief Valve — Automatically opens to relieve excessive pressure inside of the
vehicle fuel tank. The valve is part of the Multivalve.
Return Solenoid — Open when the engine is running, the return solenoid allows fuel from the
fuel rails to return to the vehicle fuel tank. The solenoid remains open for approximately 15
seconds after the engine is turned off, allowing pressure in the fuel rails to return to the vehicle
fuel tank. The solenoid is part of the FRPCM.
Fill Valve — Serves as the fuel fill inlet to the vehicle fuel tank for attachment of the fill station
hose. The valve is a one way single back check valve that opens during the fuel fill process
and closes when fueling is complete to minimize fuel from escaping.
Supply Solenoid — Solenoid that is open (energized) when the engine is running, allowing
fuel to flow from the vehicle fuel tank to the fuel rails. The solenoid is closed when the engine
is turned off, preventing fuel from flowing from the vehicle fuel tank to the fuel rails. The
solenoid is part of the FRPCM.
Smart Relay Module — Module that controls the actuation of the four solenoid valves in the
fuel rail pressure control module.
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