MULTIQUIP QP303H Guide

OPERATION AND PARTS MANUAL
Revision #1 (09/09/10)
MODEL QP303H
CENTRIFUGAL PUMP
(Honda GX160K1TX2/GX160U1TX2
Gasoline Engine)
THIS MANUAL MUST ACCOMPANYTHE EQUIPMENT AT ALLTIMES.
To find the latest revision of this
publication, visit our website at:
www.multiquip.com

PAGE 2 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)

QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 3
NOTE PAGE

PAGE 4 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
Specification and part number
are subject to change without
notice.
NOTE
QP303H Gasoline-Powered
Centrifugal Pump
Proposition 65 Warning ............................................. 2
Table of Contents ...................................................... 4
Parts Ordering Procedures ....................................... 5
Safety Information .................................................. 6-9
Pump Specifications/Dimensions .............................10
Engine Specifications ............................................... 11
General Information .................................................12
Pump Components ..................................................13
Basic Engine ............................................................14
Pre-Inspection (Engine) ...........................................15
Pre-Set-up (Pump) ................................................... 16
Initial Start-up (Engine) ...................................... 17-18
Maintenance (Pump) ......................................... 19-20
Maintenance (Engine)........................................ 21-22
Preparation for Long-Term Storage .........................23
Troubleshooting (Pump)...........................................24
Troubleshooting (Pump/Engine) .............................. 25
Explanation Of Code In Remarks Column ...............26
Suggested Spare Parts ............................................27
Component Drawing
Pump Assy. ........................................................ 28-29
QP303H — TABLE OF CONTENTS
HONDA GX160K1TX2/
GX160U1TX2 Engine
Air Cleaner (Dual) Assembly .............................. 30-31
Camshaft Assembly ........................................... 32-33
Carburetor Assembly ......................................... 34-35
Control Assembly ............................................... 36-37
Crankcase Cover Assembly ............................... 38-39
Crankshaft Assembly ......................................... 40-41
Cylinder Barrel Assembly ................................... 42-43
Cylinder Head Assembly .................................... 44-45
Fan Cover Assembly .......................................... 46-47
Flywheel Assembly ............................................ 48-49
Fuel Tank Assembly ........................................... 50-51
Ignition Coil Assembly ........................................ 52-53
Muffler Assembly ............................................... 54-55
Piston Assembly ................................................. 56-57
Recoil Starter Assembly..................................... 58-59
Labels ................................................................ 60-61
Terms and Condition Of Sale —Parts .................... 62

QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 5
QP303H — PARTS ORDERING PROCEDURES
www.multiquip.com
Ordering parts has never been easier!
Choose from three easy options:
WE ACCEPT ALL MAJOR CREDIT CARDS!
When ordering parts, please supply:
RDealer Account Number
RDealer Name and Address
RShipping Address (if different than billing address)
RReturn Fax Number
RApplicable Model Number
RQuantity, Part Number and Description of Each Part
RSpecify Preferred Method of Shipment:
UPS/Fed ExDHL
NPriority OneTr u c k 
NGround
NNext Day
NSecond/Third Day
If you have an MQ Account, to obtain a Username
and Password, E-mail us at: parts@multiquip.
com.
To obtain an MQ Account, contact you
r
District Sales Manager for more information.
Order via Internet (Dealers Only):
Order parts on-line using Multiquip’s SmartEquip website!
NView Parts Diagrams
NOrder Parts
NPrint Specification Information
Note: Discounts Are Subject To Change
Goto www.multiquip.com and click on
Order Parts to log in and save!
Use the internet and qualify for a 5% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Fax (Dealers Only):
All customers are welcome to order parts via Fax.
Domestic (US) Customers dial:
1-800-6-PARTS-7 (800-672-7877)
Fax your order in and qualify for a 2% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Phone: Domestic (US) Dealers Call:
1-800-427-1244
Best Deal!
International Customers should contact
their local Multiquip Representatives for
Parts Ordering information.
Non-Dealer Customers:
Contact your local Multiquip Dealer for
parts or call 800-427-1244 for help in
locating a dealer near you.
Note: Discounts Are Subject To Change
Effective:
January 1st, 2006
NOTICE
All orders are treated as Standard Orders and will
ship the same day if received prior to 3PM PST.

PAGE 6 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
QP303H — SAFETY INFORMATION
FOR YOUR SAFETY AND SAFETY OF OTHERS!
Safety precautions should be followed at all
times when operating this equipment. Failure
to read and understand the safety messages
and operating instructions could result in injury
to yourself and others.
This manual has been developed to
provide complete instructions for the
safe and efficient operation of this
equipment. Refer to the engine
manufacturer’s instructions for data
relative to its safe operation.
Before using this equipment ensure that the operating
individual has read and understood all instructions in this
manual.
SAFETY MESSAGES
The three safety messages shown below will inform you
about potential hazards that could injure you or others.
The safety messages specifically address the level of
exposure to the operator, and are preceded by one of three
words: DANGER, WARNING or CAUTION.
HAZARD SYMBOLS
Potential hazards associated with the operation of this
equipment will be referenced with hazard symbols which
may appear throughout this manual in conjunction with
safety messages.
DANGER
You WILL be KILLED or SERIOUSLY INJURED if you
DO NOT follow these directions.
WARNING
You CAN be KILLED or SERIOUSLY INJURED if you
DO NOT follow these directions.
CAUTION
You CAN be INJURED if you DO NOT follow these
directions.

QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 7
 NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to cool
before servicing engine or pump. Never
operate the engine with heat shields or
guards removed.
 ALWAYS allow the engine to cool before adding fuel or
performing service and maintenance functions. Contact
with hot components can cause serious burns.
 NEVER operate this equipment in any enclosed or narrow
area where free flow of the air is restricted. The engine
of this equipment requires an adequate free flow of
cooling air. If the air flow is restricted it will cause serious
damage to the equipment or
engine and may cause injury
to people and property. The
engine fuel exhaust gases
contain poisonous carbon
monoxide. This gas is
colorless and odorless, and
can cause death if inhaled.
 ALWAYS refuel in a well-ventilated area, away from
sparks and open flames. DO NOT fill the fuel tank while
the engine is running or hot. DO NOT overfill tank, since
spilled fuel could ignite if it comes into contact with hot
engine parts or sparks from the ignition system. Store
fuel in approved containers.
 ALWAYS use extreme caution when working with
flammable liquids.When refueling, stop the engine and
allow it to cool.
 DO NOT smoke around or near the
equipment. Fire or explosion could result
from fuel vapors, or if fuel is spilled on a
hot engine.
 NEVER operate the equipment in an
explosive atmosphere or near combustible
materials. An explosion or fire could result
causing severe bodily harm or even death.
 ALWAYS store equipment properly when it is not being
used. Equipment should be stored in a clean, dry location
out of the reach of children.
GENERAL SAFETY
 DO NOT operate or service this equipment
before reading the entire manual. The
equipment is to be operated by trained and
qualified personnel only! The equipment is
for industrial use only.
 This equipment should not be operated by persons under
18 years of age.
 NEVER operate this equipment without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job.
 NEVER operate this equipment when not
feeling well due to fatigue, illness or when
under medication.
 NEVER operate this equipment under the influence of
drugs or alcohol.
 NEVER disconnect any “emergency or safety
devices.” These devices are intended for operator safety.
Disconnection of these devices can cause severe injury,
bodily harm or even death! Disconnection of any of these
devices will void all warranties.
 NEVER use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
to the equipment and/or injury to user may result.
 Manufacturer does not assume responsibility for any
accident due to equipment modifications. Unauthorized
equipment modification will void all warranties.
 Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.
 ALWAYS check the equipment for loosened threads or
bolts before starting.
QP303H — SAFETY INFORMATION

PAGE 8 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
QP303H — SAFETY INFORMATION
■ NEVER run engine without air cleaner. Severe engine
damage may occur.
■ ALWAYS ensure pump is on level ground before use.
■ NEVER pump volatile, explosive,
flammable or low flash point fluids.
These fluids could ignite or explode.
NEVER pump corrosive chemicals or
water containing toxic substances.
These fluids could create serious health
and environmental hazards. Contact
local authorities for assistance.
■ NEVER open the priming plug when pump is hot. Hot
water inside could be pressurized much like the radiator
of an automobile. Allow pump to cool to the touch before
loosening plug.The possibility exists of scalding, resulting
in severe bodily harm.
■ NEVER block or restrict flow from discharge hose.
Remove kinks from discharge line before starting pump.
Operation with a blocked discharge line can cause water
inside pump to overheat.
■ ALWAYS fill the pump casing with water before starting
the engine. Failure to maintain water inside the pump
housing will cause severe damage to the pump and
mechanical seal.
■ In winter drain water from pump housing to prevent
freezing.
■ NEVER tamper with the factory setting of
the engine governor. Personal injury and
equipment damage can result if operating
in speed ranges above the maximum
allowable.
LOADING AND UNLOADING
■ Before lifting, make sure that equipment parts (hook and
vibration insulator) are not damaged and screws are not
loosened or lost.
■ ALWAYS make sure crane or lifting device has been
properly secured to the lifting bail (hook) of the
equipment.
■ NEVER lift the equipment while the engine is running.
■ Use adequate lifting cable (wire or rope) of sufficient
strength.
■ Use one point suspension hook and lift straight upwards.
■ NEVER allow any person or animal to stand underneath
the equipment while lifting.
■ DO NOT lift machine to unnecessary heights.
TRANSPORTING
 ALWAYS shutdown engine before transporting.
 Tighten fuel tank cap securely and close fuel cock to
prevent fuel from spilling.
 ALWAYS tie down the equipment during transport by
securing the equipment with rope.

QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 9
QP303H — SAFETY INFORMATION
REFUELING
MAINTENANCE SAFETY
■ NEVER lubricate components or attempt service on a
running machine.
■ ALWAYS allow the machine a proper amount of time to
cool before servicing.
■ Keep the equipment in proper running condition.
■ Fix damage to the equipment immediately and always
replace broken parts.
■ Dispose of hazardous waste properly. Examples of
potentially hazardous waste are used motor oil, fuel and
fuel filters.
■ DO NOT use food or plastic containers to dispose of
hazardous waste.
■ DO NOT pour waste, oil or fuel directly onto the ground,
down a drain or into any water source.
EMERGENCIES
■ ALWAYS know the location of the nearest
fire extinguisher .
■ ALWAYS know the location of the nearest
first aid kit .
■ In emergencies, always know the location
of the nearest phone or keep a phone on the job site .
Also know the phone numbers of the nearest
ambulance , doctor and fire department . This
information will be invaluable in case of emergency.

PAGE 10 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
QP303H — SPECIFICATIONS/DIMENSIONS (PUMP)
Figure 1. QP303H Dimensions
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QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 11
QP303H — SPECIFICATIONS/DIMENSIONS (ENGINE)
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PAGE 12 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
QP303H — GENERAL INFORMATION
APPLICATION
The
QP303H CentrifugalTrash Pump is designed to be used
for de-watering applications. Both the suction and discharge
ports on the QP303H pump use a 3-inch diameter opening,
which allows the pump to pump at a rate of approximately 267
gallons/minute (gpm) or 1,011 liters/minute (lpm).
Centrifugal or self priming pumps are designed to purge air from
the suction line and create a partial vacuum in the pump body.
The reduced atmospheric pressure inside the pump allows water
to flow through the suction line and into the pump body. The
centrifugal force created by the rotating impeller pressurizes the
water and expels it from the pump.
Power Plant
This centrifugal pump is powered by an 5.5 horsepower air cooled
4-stroke, single cylinder
HONDA GX-160 gasoline engine that
incorporates a low "
Oil Alert Feature "
Oil Alert Feature
In the event of
low oil or no oil , the HONDA GX-160 engine has
a built-in oil alarm engine shut-down feature. In the event the oil
level is low the engine will automatically shut-down.
Standard Centrifugal Pump
Standard centrifugal pumps provide an economical choice for
general purpose dewatering. These types of pumps should only
be used in
clear water applications (agricultural, industrial,
residential) as they have a limited soild handling capability of
only 10% by volume.
Suction Lift
This pump is intended to be used for dewatering applications
and is capable of suction lifts up to 25 feet at sea level. For
optimal suction lift performance keep the suction hose or line as
short as possible. In general always place the pump as close to
the water as possible.
Pump Support
The pump should always be placed on
solid stationary ground
in a level position.
NEVER place the pump on
soft soil . The suction hose or pipe
connection should always be checked for tightness and leaks. A
small suction leak in the hose or fittings could prevent the pump
from priming.
Elevation
Higher elevations will effect the performance of the pump. Due to
less atmospheric pressure at higher altitudes, pumps DO NOT
have the priming ability that they have at sea level. This is due to
the “thinner air” or lack of oxygen at higher altitudes.
A general rule of thumb is that for every 1,000 feet of elevation
above sea level a pump will lose one foot of priming ability.
For example, in Flagstaff, Arizona where the elevation is
approximately 7,000 feet, the pump would have a suction lift of
only 18 feet rather than the 25 feet at sea level. Table 3 shows
suction lift at various elevations.
Table 4 shows percentage drops in performance as elevation
increases.
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QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 13
1. Pump – The model QP303H is 3-inch centrifugal pump
used in general de-watering applications. Typical
dewatering applications consist of manholes, septic tanks,
fast and slow seepage ditch water, silt water, mud water
and muck water.
2. Fill Cap – Prior to operation, the pump casing should be
filled with water. Remove this cap to add water to the pump.
After the initial prime, a sufficient amount of water will be
retained in the casing so that the operator will not need to
re-prime later.
If the casing is dry or has insufficient water, the pump will
have difficulty in priming which could lead to premature
mechanical seal wear thus causing damage to the pump.
3. Discharge Port – Connect a 3-inch discharge hose to this
port.
4. Worm Clamp – Used to secure the hose to the inlet and
outlet ports on the pump. Use two clamps to secure the
hose on the inlet side of the pump.
5. Discharge Hose – Connect this flexible rubber hose to
the discharge port on the pump. Make sure that the hose
lays flat and is not kinked. Use only recommended type
discharge hose. Contact Multiquip parts department for
ordering information.
6. Suction Port – Connect a 3-inch inlet hose to this port.
Use two worm clamps to secure the hose.
7. Suction Hose – Connect this flexible rubber hose to the
suction port on the pump. Make sure that the hose lays flat
and is not kinked. Use only recommended type suction
hose. Contact Multiquip parts department for ordering
information.
8. Drain Plug – Remove this plug to drain water from the
pump.
9. Strainer – Always attach a strainer to bottom side of the
suction hose to prevent large objects and debris from
entering the pump. Strainer should be positioned so that it
will remain completely under water. Running the pump with
the strainer above water for long periods can damage pump.
QP303H — PUMP COMPONENTS
Figure 2. QP303H Pump Application
Figure 2 shows a typical application using the QP303H centrifugal pump. Please note that this pump is intended for the removal of
clean water.

PAGE 14 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
QP303H — BASIC ENGINE
Figure 3. Engine Controls and Components
INITIAL SERVICING
The engine (Figure 3) must be checked for proper lubrication and
filled with fuel prior to operation. Refer to the manufacturers engine
manual for instructions & details of operation and servicing. The
engine shown above is a HONDA engine, operation for other
types of engines may vary somewhat.
1. Fuel Filler Cap – Remove this cap to add unleaded
gasoline to the fuel tank. Make sure cap is tightened
securely. DO NOT over fill.
6. Choke Lever – Used in the starting of a cold engine, or in
cold weather conditions. The choke enriches the fuel
mixture.
7. Air Cleaner – Prevents dirt and other debris from entering
the fuel system. Remove wing-nut on top of air filter
cannister to gain access to filter element.
8. Spark Plug – Provides spark to the ignition system. Set
spark plug gap to 0.6 - 0.7 mm (0.028 - 0.031 inch) Clean
spark plug once a week.
9. Muffler – Used to reduce noise and emissions.
10. Fuel Tank – Holds unleaded gasoline. For additional
information refer to engine owner's manual.
Operating the engine without an
air filter, with a damaged air filter,
or a filter in need of replacement
will allow dirt to enter the engine,
causing rapid engine wear.
2. Throttle Lever – Used to adjust engine RPM speed (lever
advanced forward
SLOW , lever back toward operator
FAST ).
3. Engine ON/OFF Switch – ON position permits engine
starting, OFF position stops engine operations.
4. Recoil Starter (pull rope) – Manual-starting method. Pull
the starter grip until resistance is felt, then pull briskly and
smoothly.
5. Fuel Valve Lever – OPEN to let fuel flow, CLOSE to stop
the flow of fuel.
NOTE
CAUTION - Fueling The Engine
Adding fuel to the tank should be done only when
the engine is stopped and has had an
opportunity to cool down. In the event of a fuel
spill, DO NOT attempt to start the engine untill
the fuel residue has been completely wiped up,
and the area surrounding the engine is dry.
Engine components can generate extreme heat.
To prevent burns, DO NOT touch these areas
while the engine is running or immediately after
operating. NEVER operate the engine with the
muffler removed.
CAUTION - Burn Hazard

QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 15
QP303H — PRE-INSPECTION (ENGINE)
Figure 4. Engine Oil Dipstick (Removal)
3. Insert and remove the dipstick without screwing it into the filler
neck. Check the oil level shown on the dipstick.
4. If the oil level is low (Figure 5), fill to the edge of the oil filler
hole with the recommended oil type (Table 5).Maximum oil
capacity is 1.16 quarts (1.1 liters)
Figure 5. Engine Oil Dipstick (Oil Level)
Before Starting
1. Read safety instructions at the
beginning of manual.
2. Clean the pump, removing dirt and
dust, particularly the engine
cooling air inlet, carburetor and air
cleaner.
3. Check the air filter for dirt and dust. If air filter is dirty, replace
air filter with a new one as required.
4. Check carburetor for external dirt and dust. Clean with dry
compressed air.
5. Check fastening nuts and bolts for tightness.
Engine Oil Check
1. To check the engine oil level, place the pump on secure
level ground with the engine stopped.
2. Remove the filler dipstick from the engine oil filler hole
(Figure 4) and wipe clean.
Fuel Check
1. Remove the gasoline cap located on top of fuel tank.
2. Visually inspect to see if the fuel level is low. If fuel is low,
replenish with unleaded fuel.
3. When refueling, be sure to use a strainer for filtration. DO
NOT top-off fuel. Wipe up any spilled fuel
immediately!
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Explosive Fuel
Diesel is extremely flammable, and its vapors
can cause an explosion if ignited. DO NOT
start the engine near spilled fuel or
combustible fluids. DO NOT smoke while
refueling. DO NOT attempt to refuel the pump
if the engine is
hot! or running .
WARNING - Explosive Fuel

PAGE 16 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
Before Starting
1. Read safety instructions at the
beginning of manual.
2. Place pump as near to water as
possible, on a firm flat, level surface.
3. To prime pump, remove fill cap (Figure 2) and fill pump casing
with water. If the pump casing is not filled with water before
starting, it will not begin pumping.
QP303H — PRE-SETUP (PUMP)
4. Check for leaks between pump and engine. If water is leaking
between the pump and engine housing, the seal inside the
pump may be worn or damaged. Continued operation of the
pump is not recommended. Further usage of the pump under
these conditions may cause severe water damage to engine.
Hoses and Clamps
1. Check that all hoses are
securely attached to the pump.
Make certain suction hose (Figure 2) does not have any air
leakage.Tighten hose clamps and couplings as required.
2. It is recommended that 2 clamps be used when securing the
suction hose to the inlet side (suction) of the pump.
3. Remember suction hoses must be
rigid enough not to
collapse when the pump is in operation.
4. Check that the discharge hose (Figure 2) is not restricted.
Place hose so that it lays as straight as it is possible on the
ground. Remove any twists or sharp bends from hose which
may block the flow of water.
NOTE Suction and discharge hoses are
available from Multiquip. Contact
your nearest dealer for more
information.
5. The discharge hose is usually a collapsible (thin-walled)
hose, however if a thin-walled discharge hose is not avail-
able, a rigid suction hose can be substituted in its place.
6. Make sure the suction strainer (Figure 2) is clean and
securely attached to the water end of the suction hose. The
strainer is designed to protect the pump by preventing large
objects from being pulled into the pump.
Pump casing must be filled with water before using pump.
Otherwise pump will not be able to begin pumping.
CAUTION - Pump Casing
DO NOT open fill cap if pump is hot!
Water inside may be under pressure.
The possibility exists of scalding,
resulting in severe bodily harm.
WARNING - High Pressure The strainer should be positioned so it will remain completely
under water . Running the pump with the strainer above
water for long periods can damage the pump.
CAUTION - Strainer
CAUTION - Flammable Fluids-Chemicals
DO NOT pump flammable fluids, corrosive chemicals or fluids
containing toxic substances. These fluids can create potentially
dangerous health and environmental hazards. Contact local
authorities for assistance.
CAUTION - Mechanical Seal
This pump uses a water-cooled mechanical seal to prevent
water from seeping into the engine. The passage of water
through the pump casing lubricates the seal and prevents it
from overheating.
NEVER! operate the pump without water
in the casing as this will cause damage to the mechanical
seal.

QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 17
QP303H — INITIAL START-UP (ENGINE)
Starting the Engine ( HONDA engine)
1. Place the engine
fuel valve lever (Figure 6) to the "ON"
position.
2. Move the
throttle lever (Figure 7) away from the slow
position, about 1/3 of the way toward the fast position.
Figure 6. Engine Fuel Valve Lever (ON Position)
Figure 7. Throttle Lever (1/3 Start Position)
3. Place the
choke lever (Figure 8) in the " OPEN " position if
starting a
cold engine.
4. Place the
choke lever (Figure 9) in the " CLOSED " position
if starting a
warm engine or the temperature is warm.
Figure 8. Engine Choke Lever (Open)
Figure 9. Engine Choke Lever (Closed)
5. Place the
engine ON/OFF switch (Figure 10) in the " ON "
position.
Figure 10. Engine ON/OFF Switch (ON Position)
This section is intended to assist the operator with the
initial
start-up
of the trash pump. It is extremely important that this
section be read carefully before attempting to use the pump in
the field.
DO NOT attempt to operate the pump until the Safety, General
Information and Inspection sections of this manual have been
read and thoroughly understood .
CAUTION - Read Manual

PAGE 18 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
QP303H — INITIAL START-UP (ENGINE)
6. Grasp the starter grip (Figure 11) and slowly pull it out.The
resistance becomes the hardest at a certain position, corre-
sponding to the compression point. Pull the starter grip briskly
and smoothly for starting.
7. If the engine has started, slowly return the choke lever
(Figure 12 ) to the
CLOSED position. If the engine has not
started repeat steps 1 through 6.
Figure 11. Starter Grip
8. Before the pump is placed into operation, run the engine for
several minutes. Check for fuel leaks, and noises that would
associate with a lose component.
9. To begin pumping, place the throttle lever (Figure 13) in the
"
RUN "position.
Figure 12. Choke Lever (Closed)
Figure 13. Throttle Lever (Run)
Stopping The Engine
Normal Shutdown
1. Move the throttle lever to the IDLE position (Figure 14) and
run the engine for three minutes at low speed.
Figure 14.Throttle Lever (Idle)
2. After the engine
cools , turn the engine ON/OFF switch to the
“OFF” position (Figure 15).
3. Place the fuel shut-off lever (Figure 16) in the OFF
position.
Figure 15. Engine ON/OFF Switch (OFF)
Figure 16. Fuel Valve Lever (OFF)
Emergency Showdown
1. Move the throttle lever quickly to the IDLE position, and place
the engine ON/OFF switch in the
OFF position.
ALWAYS run engine at full speed while pumping.
CAUTION - Maximum Engine Speed

QP303H CENTRIFUGAL PUMP — PARTS MANUAL— REV. #1 (09/09/10) — PAGE 19
QP303H — MAINTENANCE (PUMP)
To perform the pump vacuum test do the following:
1. Remove the pump fill cap (Figure 2), and fill the pump
with water.
2. Start the engine as outlined in the initial start-up section,
and wait for the pump to begin pumping.
3. As shown in Figure 17 (next page), place a water hose
inside the discharge opening of the pump, and turn on
the water. This flow of water into the discharge opening
will
prevent the pump from running dry.
4. Place the Pump Vacuum Tester (P/N 7000030) over
the pump suction (inlet) opening (Figure 17) with the
vacuum gauge facing upwards. It may be necessary to
apply a small amount of water around the rubber seal of
the vacuum tester to make a good suction fit.
5. Check and make sure that there are no air leaks between
the vacuum tester and the inlet port on the pump. If air
leaks are present reseat vacuum tester.
6. Run the pump for a few minutes while monitoring the
vacuum gauge. If the gauge indicates a reading between
-25 and -20 in. Hg. (inches of mercury) then it can be
assumed that the pump is working correctly.
Pump Vacuum Test 7. If the vacuum tester gauge indicates a reading
below -20 in. Hg, it can then be assumed that the pump
is not functioning correctly, and corrective action needs
to be taken.
8. To test the
flapper valve , shut down the engine. The
vacuum tester should remain attached to the pump
suction inlet port by vacuum. This indicates the pump's
flapper valve is seating properly to hold water in the
suction hose when the engine is stopped.This prevents
backflow and allows for faster priming when the engine
is restarted.
25 in. Hg (inches of mercury)
translates into 25 feet of lift at sea
level .
NOTE
CAUTION - Pump Priming
DO NOT attempt to start the engine unless the pump has
previously been
primed with water. Severe pump damage
will occur if pump has not been primed.

PAGE 20 — QP303H CENTRIFUGAL PUMP — PARTS MANUAL — REV. #1 (09/09/10)
QP303H — MAINTENANCE (PUMP)
Figure 17. Pump Vacuum Tester
Pressure reading may vary
depending on altitude. See Tables 3
and 4 on page 12.
NOTE