ICON MH-MF54 User manual
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Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back
of the manual near the assembly diagram (or month and year of purchase if product has no number). Keep
this manual and the receipt in a safe and dry place for future reference. 21d
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright© 2021 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
To ol s r eq ui r ed f o r as s em bl y a nd se rvice m a y not be i nc luded.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Page 2 For technical questions, please call 1-888-866-5797. Item 64938
Specifications
Pressure Scale
Gauge Accuracy ± 1.6%
Important Safety Information
Read all safety warnings and instructions. Failure to follow the warnings and
instructions may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
1. Stay Keep your work area clean
and well lit. Cluttered and dark
work areas invite accidents.
2. Stay alert. Watch what you are doing,
and use common sense when operating
tools and equipment. Do not assemble
or use this product while tired or under
the influence of drugs, alcohol, or
medication. A moment of inattention
while operating tools and equipment
may result in serious personal injury.
3. Wear eye protection. Wear
ANSI-approved safety impact
glasses and full face shield
when using this product.
4. Do not force the Service Kit. Use the
correct product for your application. The
correct product will do the job better and
safer at the rate for which it is designed.
5. Maintain the Service Kit with care.
Keep this product clean. Properly
maintained products are less likely
to malfunction. Do not use damaged
products. Tag damaged products
“Do not use” until repaired.
6. Check for any condition that
may negatively affect operation
of the Service Kit. If readings are
inconsistent, or if it appears that the
fuel gauge is not functioning properly,
the Service Kit should be serviced
by a qualified service technician.
Many accidents are caused by
poorly maintained products.
7. Use only accessories that are
recommended by the manufacturer
for your model. Accessories that
may be suitable for one product
may become hazardous when
used on another product.
8. Industrial applications must follow
OSHA requirements.
9. Maintain labels and nameplates
on the Service Kit. These
carry important information. If
unreadable or missing, contact
Harbor Freight Tools for a replacement.
10. Use the right product for the job.
There are certain applications for
which this product was designed.
Do not use small products to do the
work of larger industrial products. Do
not use this product for a purpose
for which it was not intended.
Page 3For technical questions, please call 1-888-866-5797.Item 64938
11. Product service must be performed
only by qualified service
technician. Service or maintenance
performed by unqualified personnel
could result in a risk of injury.
12. When servicing the Service Kit,
use only identical replacement
parts. Follow instructions in the
“Inspection, Maintenance, And
Cleaning” section of this manual. Use
of unauthorized parts or failure to
follow maintenance instructions may
create a risk of personal injury.
13. Always make sure the area of
use for this product is clear
of any children. Do not allow
children to play with this product.
14. Do not allow the vehicle’s engine
to run while using the Service Kit.
When running, the engine of a
vehicle produces carbon monoxide,
a colorless, odorless, toxic gas
that, when inhaled, can cause
serious personal injury or death.
15. Prior to using this product, make
sure to read and understand
all instructions and safety
precautions as outlined in the
vehicle manufacturer’s manual.
16. Always keep hands and fingers
away from the moving parts
and hot parts of an engine.
17. Do not use this Service Kit
on diesel fuel systems.
18. Do not smoke while performing
any fuel injection tests or repairs.
19. Always have a dry chemical (Class B)
fire extinguisher within reach.
20. Make sure to provide a suitable
container to catch released fuel
when the system is depressurized.
21. Take extra care to prevent fuel
from contacting hot engine parts.
It is recommended that tests be
performed when the engine is cold.
22. If a drop light is used, do
not allow fuel to contact the
hot surface of the bulb.
23. Never remove any fittings
with the engine running.
24. Never loosen any fittings or attempt
to remove hoses of vehicle or
Service Kit until you have relieved
the fuel system pressure. Refer
to the vehicle manufacturer’s
service manual for specific fuel
pressure relief procedures.
25. Always check all connections for
leaks during the testing procedure.
At any sign of leaks, turn off the
engine or disable the fuel pump.
Clean up any spilled fuel and repair
all leaks before resuming test.
26. When preparing for pressure testing,
make sure the vehicle’s transmission
is placed in “PARK” or “NEUTRAL”
and the emergency brake is applied.
27. When the test is complete,
depressurize the system and remove
the Service Kit. Reassemble the
vehicle’s fuel line(s) to its original
condition. Start the engine and
check for leaks. If any leaks are
present, stop the engine, relieve
fuel pressure and repair all leaks.
Page 4 For technical questions, please call 1-888-866-5797. Item 64938
28. People with pacemakers should
consult their physician(s) before use.
Electromagnetic fields in close proximity
to heart pacemaker could cause
pacemaker interference or pacemaker
failure. Caution is necessary when near
coil, spark plug cables, or distributor
of running engine. Engine should be
off during distributor adjustment.
29. The warnings, cautions, and instructions
discussed in this instruction manual
cannot cover all possible conditions
and situations that may occur. It must
be understood by the operator that
common sense and caution are factors
which cannot be built into this product,
but must be supplied by the operator.
SAVE THESE INSTRUCTIONS.
Applications
# Picture Description Application
1
High Pressure
Gauge with Boot
Connects to #2 for basic testing.
2
Pressure Testing
and Bleed-Off
Assembly
Connects to #1 for use in performing
tests with High Pressure Gauge and
Adapters.
3
Assembly with
Shutoff Valve
For use in testing with High Pressure
Gauge, Pressure Testing, and Bleed-
Off Assembly and Adapters.
4Seal and Service
Kit
Hose Clamps, Connection Hoses,
Washers, O-Rings, Schrader Valves
and Wrench.
5
Double Ended
Hose Adapter:
When vehicles require testing
line hose.
6
Single End
Hose Adapter:
All vehicles requiring end of line
line hose.
7Decarbonizing
Adapter
Use with a canister-type fuel
injector cleaner for intake
system decarbonizing.
Page 5For technical questions, please call 1-888-866-5797.Item 64938
# Picture Description Application
8
T-Adapter
HONDA
9Schrader Fitting
For smaller Schrader valves.
10 Schrader Fitting
For larger Schrader valves on
multi-port vehicles.
GENERAL MOTORS, CHRYSLER
test port
11
T-Adapter
FORD CFI
12
Inline T-Adapter
Inline Adapter for vehicles with
GM MPI, CHRYSLER MPFI
13
Adapter
Early GENERAL MOTORS TBI
systems supply line.
14
Adapter
Early GENERAL MOTORS TBI
systems supply line.
15
External O-Ring
Adapter
GENERAL MOTORS TBI supply line.
16
O-Ring Adapter GENERAL MOTORS TBI supply line.
17
External O-Ring
Adapter
GENERAL MOTORS TBI return line.
18
O-Ring Adapter GENERAL MOTORS TBI return line.
19
External O-Ring
Plug
GENERAL MOTORS TBI return line
plug for fuel pump pressure test.
20
Adapter
GENERAL MOTORS TBI. Replaces
fuel filter with threads on both ends.
21 FORD Spring Lock
Coupling Adapter
FORD MPI
22
90° Elbow
For larger Schrader valves on
multi-port vehicles.
Page 6 For technical questions, please call 1-888-866-5797. Item 64938
# Picture Description Application
23
90° Elbow
24
Fuel Pressure
Test Adapter
Fuel rail pressure test adapter.
25
Fuel Pressure
Test Adapter
Fuel rail pressure test adapter.
26
Fuel Pressure
Test Adapter
Fuel rail pressure test adapter.
27
Double Banjo EFI
Pressure Test
Adapter
Use with #29 to tie inline with
any fuel system test or for
fuel injection cleaning.
28
Double Banjo EFI
Pressure Test
Adapter
Use with #30 to tie inline with
any fuel system test or for
fuel injection cleaning.
29 M8 Female
Banjo Fitting
30 M12 Female
Banjo Fitting
31
O-Ring Adapter
HONDA, ACURA, STERLING Multi-
Port PGM
32
O-Ring Adapter
Asian AFC, EFI, MFI
European AFC, CIS, CISE
33
O-Ring Adapter
Asian AFC, EFI, MFI
European AFC, CIS, CISE
34
O-Ring Adapter
Asian AFC, EFI, MFI
European AFC, CIS, CISE
35
O-Ring Adapter
Asian AFC
HONDA, ACURA PGM
European AFC, CIS, CISE
36
O-Ring Adapter
TOYOTA AFC
37
O-Ring Adapter
(Long)
For vehicles with metric threads
European CIS, CISE
38
O-Ring Adapter
For vehicles with metric threads
European CIS, CISE
39
O-Ring Adapter
For vehicles with metric threads
European CIS, CISE
Page 7For technical questions, please call 1-888-866-5797.Item 64938
# Picture Description Application
40
O-Ring Adapter
(Long)
For vehicles with metric threads
European CIS, CISE
41
O-Ring Adapter
For vehicles with metric threads
European CIS, CISE
42
O-Ring Adapter
For vehicles with metric threads
European CIS, CISE
43
Swivel Adapter
For vehicles with metric threads
European CIS, CISE
44
& Internal Swivel
Adapter
For vehicles with metric threads
European CIS, CISE
45
& Internal Swivel
Adapter
For vehicles with metric threads
European CIS, CISE
46
& Internal Swivel
Adapter
For vehicles with metric threads
European CIS, CISE
47
Flare Adapter
Fuel fitting size found on some hard
line fuel connections like TOYOTA.
48
Pulse Dampener
Adapter
Fuel connection for use on some
ACURA and HONDA models.
49
Pressure Test
Rail Style
Fuel rail pressure test adapter.
Read the ENTIRE IMPORTANT SAFETY INFORMATION section
beginning on page 2 of this manual including all text under
subheadings therein before use of this product.
The instructions in the Typical Hook-Ups section on the following
pages are intended as basic guidelines only.
For information on specific tests for a particular vehicle, refer to
the vehicle manufacturer’s service manual for specifications and
Page 8 For technical questions, please call 1-888-866-5797. Item 64938
Typical Hook-Ups
Gauge
(1) Pressure Testing
and Bleed-Off
Assembly (2)
Adapter (10)
Figure A
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
4. Remove the protective cap
from test fitting on vehicle.
5. Attach the swivel female fitting on
the #10 Adapter to the test fitting
on the vehicle. Hand tighten.
6. Attach the female quick coupler on
the Pressure Testing and Bleed-
Off Assembly to the male quick
connector on the Adapter.
7. Start the engine and allow it
to idle. Check for leaks.
8. Read the Gauge and compare the result
with the pressure in service manual.
9. Stop engine and turn ignition OFF.
10. With free end of Bleed-Off Hose in
suitable container, press the button
on side of bleed-off assembly slowly
to depressurize the fuel system.
11. Refer to Safety Information before
removing Tester from vehicle.
12. Replace the protective cap onto the
test fitting on vehicle. Check for leaks.
Adapter (9)
Figure B
Pressure Testing
and Bleed-Off
Assembly (2)
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. If the vehicle has multi-port fuel
injection, the test valve is located
on the fuel rail. Remove the
protective cap from the test valve.
4. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
5. Attach the female end of
the #9 Adapter to test the
valve. Hand tighten.
6. Attach the female quick coupler on
the Pressure Testing and Bleed-Off
Assembly to the male quick coupler
on the Adapter.
7. Start the engine and allow it
to idle. Check for leaks.
8. Read the Gauge and compare result
with pressure in service manual.
9. Stop engine and turn the ignition OFF.
10. With free end of Bleed-Off Hose in
suitable container, press the button
on side of Bleed-Off Assembly slowly
to depressurize the fuel system.
Page 9For technical questions, please call 1-888-866-5797.Item 64938
11. Refer to Safety Information before
removing Tester from vehicle.
12. Replace the protective cap onto test
fitting on vehicle. Check for leaks.
Gaskets from
Seal & Service
Kit (4)
Gauge
(1) Pressure Testing
and Bleed-Off
Assembly (2)
Figure C
Adapters
(32, 33, 34,
35, 36)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. The pressure test connection for
these vehicles is located at the point
where the fuel inlet meets the fuel
rail or cold start injector. The fuel
inlet is secured to the fuel rail of cold
start injector by a banjo fitting.
4. Remove the banjo fitting that secures
the fuel inlet to the fuel rail or cold start
injector. Place a shop cloth around
the bolt to catch any spilled fuel.
5. Install one of the five pressure test
Adapters #32, 33, 34, 35, or 36 with
the corresponding sealing washer
and one of the gaskets from the banjo
fitting so that the fuel inlet is once
again connected to the fuel rail or cold
start injector. The test Adapter will
hold the banjo assembly in position.
6. Torque the Adapters to the
following specifications:
Adapter
Number Size Torque
Specifications
32
(5.5 N-m)
33
(8.0 N-m)
34
(11.0 N-m)
35
(11.0 N-m)
36
(14.0 N-m)
7. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
8. Attach the female quick coupler on
the Pressure Testing and Bleed-
Off Assembly to the male quick
coupler on the test Adapter.
9. Start the engine and allow it
to idle. Check for leaks.
10. Read the Gauge and compare the result
with pressure in the service manual.
11. Stop the engine and turn
the ignition OFF.
12. With free end of Bleed-Off Hose in a
suitable container, press the button
on side of Bleed-Off Assembly slowly
to depressurize the fuel system.
13. Refer to Safety Information before
removing Tester from vehicle.
14. Remove the Tester and the
pressure test Adapter.
15. Reassemble the banjo fitting to
the fuel inlet and fuel rail (or cold
start injector). New Gaskets from
the #4 Seal and Service Kit should
be used when reassembling
fuel lines. Check for leaks.
Page 10 For technical questions, please call 1-888-866-5797. Item 64938
Pressure Testing
and Bleed-Off
Assembly (2)
Adapter (20)
Figure D
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. Locate the fuel filter on the vehicle.
4. Remove the fuel filter by unscrewing
the fuel lines from both ends of the fuel
filter. Use a container to catch any fuel
that may spill out. Wipe off any excess
fuel that may spill on the vehicle.
5. Install the #20 Adapter in place
of the fuel filter by threading each
fuel line into either end of the
Adapter. Do not overtighten.
6. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
7. Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
8. Start the engine and check for
leaks. Read the fuel pressure.
Compare the value on the Gauge to
the value in the service manual.
9. Stop the engine and turn
the ignition OFF.
10. With free end of Bleed-Off Hose in a
suitable container, press the button
on side of Bleed-Off Assembly slowly
to depressurize the fuel system.
11. Refer to Safety Information before
removing Tester from vehicle.
12. Remove the fuel pressure Adapter
following the above instructions
for removing the fuel filter.
13. Reinstall the fuel filter. Start the
vehicle and check for leaks.
Adapter
(11 or 12)
Pressure Testing
and Bleed-Off
Assembly (2)
Figure E
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. The connection with the vehicle’s
fuel injection system is at the throttle
body. Remove the fuel line at the
inlet by prying up on the hair pin from
the coupling with a small screwdriver.
Use care as the hair pin is delicate.
Once disconnected, reinstall the
hair pin into the hair pin coupling.
4. Attach #11 Hair Pin Adapter for FORD
or #12 Hair Pin Adapter for GM and
CHRYSLER to the disconnected fuel
line. Make sure both ends of mating
parts are seated and locked together.
Page 11For technical questions, please call 1-888-866-5797.Item 64938
5. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
Attach the female quick coupler on
the Pressure Testing and Bleed-
Off Assembly to the male quick
coupler on the #11 or #12 Adapter.
6. Start the engine and allow it to idle.
Check all connections for leaks.
7. Read the Gauge and compare
the result with the pressure
values in the service manual.
8. Stop the engine and turn
the ignition OFF.
9. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to depressurize the fuel system.
10. Refer to Safety Information before
removing Tester from vehicle.
11. Remove the fuel pressure Adapter
following the above instructions.
Reinstall the vehicle’s fuel line. Start
the engine and check for leaks.
Adapter
(21)
Pressure Testing
and Bleed-Off
Assembly (2)
Figure F
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. The connection with the vehicle’s fuel
injection system is on the fuel rail.
4. A disconnect tool (not included) is
required to separate the spring lock
fitting on the vehicle’s fuel line.
5. After the spring lock fitting has
been disconnected, assemble the
#21 Adapter into the line, making
sure both ends of the mating
couplings are locked together.
6. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
7. Start the engine and allow it to idle.
Check all connections for leaks.
8. Read the Gauge and compare
the result with the pressure
values in the service manual.
9. Stop the engine and turn
the ignition OFF.
10. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to depressurize the fuel system.
Refer to Safety Information before
removing Tester from vehicle.
11. Using a disconnect tool, remove
the test Adapter and install the
vehicle’s fuel line. Start the
vehicle and check for leaks.
Page 12 For technical questions, please call 1-888-866-5797. Item 64938
Adapter (31)
Pressure Testing
and Bleed-Off
Assembly (2)
Figure G
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. The test port is at the vehicle’s
fuel filter, under the hood, just
forward of the firewall.
4. The fuel outlet is secured to the fuel
filter by a “double D” bolt. Within this
bolt is a smaller hex bolt that provides
access to the test connection.
5. Place a shop cloth around the fuel outlet
and slowly remove the smaller hex bolt.
6. Screw the small male end of the
#31 Adapter into the hole where the
removed hex bolt was. Hand tighten.
7. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
8. Start the engine and allow it to idle.
Check all connections for leaks.
9. Read the Gauge and compare
the result with the pressure
values in the service manual.
10. Stop the engine and turn
the ignition OFF.
11. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to depressurize the fuel system.
12. Refer to Safety Information before
removing tester from vehicle.
13. Re-install the hex bolt on the
fuel filter. Check for leaks.
Adapter (9)
Pressure Testing
and Bleed-Off
Assembly (2)
Figure H
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. Remove the air cleaner assembly.
The test valve is located at the
top of the throttle body unit.
4. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
5. Attach the female end of the
#9 Adapter to the test valve.
6. Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
7. Start the engine and allow it to idle.
Check all connections for leaks.
8. Read the Gauge and compare
the result with the pressure
values in the service manual.
Page 13For technical questions, please call 1-888-866-5797.Item 64938
9. Stop the engine and turn
the ignition OFF.
10. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to depressurize the fuel system.
Refer to Safety Information before
removing Tester from vehicle.
11. Start the vehicle and check for leaks.
Hose & Hose
Clamps (4)
To Inlet Fuel
Line Hose
To Throttle
Body Inlet
or
Discharge Side
Of Fuel Pump
Adapter
(5)
Pressure Testing
and Bleed-Off
Assembly (2)
Figure I
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. Loosen the hose clamp and disconnect
the fuel line hose from the inlet
side of the vehicle’s throttle body or
discharge side of the fuel pump.
4. Assemble the #5 Adapter and
Hose with Hose Clamps from
the #4 Seal and Service Kit.
5. Connect the #5 Adapter as
assembled above between the
disconnected fuel line and the throttle
body inlet or fuel pump. Tighten
all Hose Clamps securely.
6. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
7. Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
8. Start the engine and allow it to
idle. Check all connections for
leaks. Read the Gauge and
compare the result with the pressure
values in the service manual.
9. Stop the engine and turn
the ignition OFF.
10. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to depressurize the fuel system.
11. Refer to Safety Information before
removing Tester from vehicle.
12. Replace the vehicle’s fuel line and
tighten all clamps securely. Check
all connections for leaks.
Page 14 For technical questions, please call 1-888-866-5797. Item 64938
Adapter (6)
Pressure Testing
and Bleed-Off
Assembly (2)
Figure J
Gauge
(1)
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. Loosen the hose clamp and
disconnect the fuel line.
4. Install the #6 Adapter into the fuel supply
hose. Tighten hose clamp securely.
5. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
6. Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
7. Start the engine and allow it to
idle. Check all connections for
leaks. Read the Gauge and
compare the result with the pressure
values in the service manual.
8. Stop the engine and turn
the ignition OFF.
9. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to depressurize the fuel system.
10. Refer to Safety Information before
removing Tester from vehicle.
11. Reconnect vehicle’s fuel line and
tighten all clamps securely. Check
all connections for leaks.
Hose & Hose
Clamps (4)
To Inlet Fuel
Line Hose
Adapter
(5)
Pressure Testing
and Bleed-Off
Assembly (2)
Figure K
Gauge
(1)
To Throttle
Body Inlet
Nipple
1. Turn off the ignition.
2. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
3. Loosen the hose clamp and disconnect
the fuel line hose from the inlet side
of the vehicle’s throttle body.
4. Confirm if the size of the inlet
5. Assemble the correct Hose and
Hose Clamps from the #4 Seal and
Service Kit onto the #5 Adapter.
6. Connect the Adapter assembly between
the disconnected fuel line and the
throttle body inlet nipple on the vehicle.
Tighten all Hose Clamps securely.
7. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
Page 15For technical questions, please call 1-888-866-5797.Item 64938
8. Start the engine and allow it to
idle. Check all connections for
leaks. Read the Gauge and
compare the result with the pressure
values in the service manual.
9. Stop the engine and turn
the ignition OFF.
10. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to depressurize the fuel system.
Refer to Safety Information before
removing Tester from vehicle.
11. Reconnect vehicle’s fuel line and
tighten all clamps securely. Check
all connections for leaks.
Gauge (1)
Pressure Testing
and Bleed-Off
Assembly (2)
Adapters
(32, 33, 34, 35, 37,
38, 40, 41, 42, 43,
44, 45, or 46)
and O-Rings from
Seal & Service
Kit (4)
CIS/TBI Testing
Assembly with
Shutoff Valve (3) Figure L
1. Turn off the ignition.
2. Clean the top of the fuel distributor to
keep dirt from entering the fuel system.
3. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
4. The CIS system has a primary circuit
with pressure regulated at the fuel
distributor. This is known as supply
pressure, primary pressure, or line
pressure. The side of the Tester without
the shutoff valve is connected to this
circuit. The other circuit is known as
the control circuit. This contains the
control pressure regulator, known
as the warm-up compensator. The
side of the Tester with the shutoff
valve is connected to this circuit.
5. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
6. Install Adapter(s) #32, 33, 34, 35, 37,
38, 40, 41, 42, 43, 44, 45, or 46 and
O-Ring from the #4 Seal and Service Kit
to the engine as required. Hand tighten
only. Then connect Hoses to Adapters.
7. Attach the female quick coupler on
the Pressure Testing and Bleed-Off
Assembly to the male quick coupler
with Shutoff Valve. With free end
of Bleed-Off Hose in a suitable
container, press button on side
of Bleed-Off Assembly slowly to
release any air in the test Hose.
8. Refer to Safety Information before
removing Tester from vehicle. Remove
Tester and Adapters from vehicle.
Reconnect vehicle’s fuel injection
lines to original condition. Start
the vehicle and check for leaks.
Page 16 For technical questions, please call 1-888-866-5797. Item 64938
Gauge (1)
Pressure Testing
and Bleed-Off
Assembly (2)
Adapters
(32, 33, 34, 35, 37,
38, 40, 41, 42, 43,
44, 45, or 46)
and O-Rings from
Seal & Service
Kit (4)
Figure M
1. Turn off the ignition.
2. Clean the top of the fuel distributor to
keep dirt from entering the fuel system.
3. Relieve the fuel pressure. Refer
to the vehicle’s service manual for
specific pressure relief procedures.
4. Connect the Gauge to the Pressure
Testing and Bleed-Off Assembly.
5. Install Adapter(s) #32, 33, 34, 35,
37, 38, 40, 41, 42, 43, 44, 45, or 46
and O-Ring from the #4 Seal and
Service Kit to the engine as required.
6. Attach the female quick coupler
on the Pressure Testing and
Bleed-Off Assembly to the male
quick coupler on the Adapter.
7. Start the engine and allow it to
idle. Check for leaks. Read
the fuel pressure. Compare
the value on the Gauge to the
value in the service manual.
8. With free end of Bleed-Off Hose in a
suitable container, press button on
side of Bleed-Off Assembly slowly
to release any air in the test Hose.
Refer to Safety Information before
removing Tester from vehicle.
9. Remove Tester and
Adapter(s) from vehicle.
10. Reconnect vehicle’s fuel injection
lines to original condition.
11. Start vehicle and check for leaks.
Page 17For technical questions, please call 1-888-866-5797.Item 64938
Maintenance
Procedures not specifically explained in this manual must be performed
only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM TOOL FAILURE: Do not use damaged
equipment. If abnormal noise, vibration, or leaking air occurs, have the problem
corrected before further use.
1. BEFORE EACH USE, inspect the
general condition of the tool. Check for:
loose hardware
cracked, worn, or damaged Adapters
damaged Pressure Gauge and Hose
any other condition that may
affect its safe operation.
If a problem occurs, have the problem
corrected before further use.
Do not use damaged equipment.
2. AFTER EACH USE, wipe external
surfaces of the tool with clean cloth.
3. Periodically check the
threads for damage.
4. Keep clean and free from dirt,
grease and grit.
5. Store tool in its Carrying
Case when not in use.
PLEASE READ THE FOLLOWING CAREFULLY
LIST AND ASSEMBLY DIAGRAM IN THIS DOCUMENT AS A REFERENCE
TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR MAKES ANY
REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE
OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT
HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN
ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY
CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER
ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO
THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING
OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Page 18 For technical questions, please call 1-888-866-5797. Item 64938
Parts List and Diagram
Parts List
Part Description
1
& Hang-Up Hook
2 Pressure Testing and Bleed-Off Assembly
3
4 Seal And Service Kit
5
6
7 Decarbonizing Adapter
8
9
10
11
12
13
14
15
16
17
18
19
20
21 FORD Spring Lock Coupling Adapter
22
23
24
25
26
Part Description
27 EFI Pressure
Test Adapter
28 EFI
Pressure Test Adapter
29 M8 Female Banjo Fitting
30 M12 Female Banjo Fitting
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
BSPT
46
47
48
Dampener Adapter
49
50 Carrying Case (not shown)
Record Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts. Specify UPC 792363649384 when ordering parts.
Page 19For technical questions, please call 1-888-866-5797.Item 64938
Diagram
9
10
11
12
21
7
8
2
3
26
27 28 29 30
124
23
22
20
19
18
17
16
15
14
13
6
5
25
31
32 33 34 35 36 37
38 39 40 41 42 43
44 45 46 47 48
49 4
Limited Lifetime Warranty
Harbor Freight Tools warrants to the original purchaser that this ICON™ product
shall be free from defects in materials and workmanship for its useful life.
If your ICON™ product does not perform in accordance with this warranty,
Harbor Freight Tools will, at its option and expense, repair or replace (or elect to
refund the purchase price if we cannot repair or replace), your ICON™ product,
which shall be your sole and exclusive remedy. To obtain warranty service,
ICON™ products must be returned with proof of purchase to a Harbor Freight Tools
retail store or returned by mail after contacting Harbor Freight Tools Product
Support at 1-888-866-5797 and receiving a return authorization.
This warranty excludes normal wear and tear and does not apply to products subjected
to misuse, use or operation other than for the intended purpose or not in accordance
with the product manual, abuse, accident, modification or alteration, unauthorized
repair, improper storage, neglect, or lack of maintenance. This warranty is in lieu of
all other warranties. Harbor Freight Tools is not liable for incidental, indirect, special,
consequential, or punitive damages or costs arising from the use of this product. Some
states do not allow the exclusion or limitation of incidental or consequential damages,
so the above limitation may not apply to you. This warranty gives you specific
legal rights, and you may also have other rights which vary from state to state.
ICON is a trademark of Harbor Freight Tools. All other brands and trade
names are the property of their respective owners.
26541 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797
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