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Please Note: It is illegal to ship or transport any hazardous 

chemicals without United States Environmental Protection 

Agency Licensing. 

1. Always drain and flush pumps before servicing or 

disassembling for any reason.

2. Before returning unit for repair, drain out all liquids and 

flush unit with neutralizing liquid. Then, drain the pump. 
Attach a tag or include a written notice certifying that this 
has been done.

3. Never store pumps containing a hazardous chemical.

Hazardous Substance Alert

Prior to Mounting

Before setting up the pump for operation, check to see that 
the motor and pump turn freely by hand. If it cannot be turned 
over by pulling on the recoil starter, open casing to check for 
obstructions lodged in pump.

Selecting the Suction Line

To get full capacity of the pump, the suction line should be the 
same size as the pump suction port. If suction hose is longer 
than approximately 6 feet, use next size larger hose. 
The suction line must be free of air leaks. All joints and 
connections of the suction line must be tightened securely so 
that no additional air may enter the suction side through a 

loose connection. Use a good grade of suction hose that will 
not collapse.

Basket Strainer

The basket strainer supplied with this pump is 
to be used when transferring solutions that may 
contain debris and solids which could become 
lodged in the pump or damage the impeller. 
Because of the high flow capacity of  this  
pump,  unknown  debris  could  be siphoned off 
the bottom of the tank. Install the strainer on the suction side 
of the pump whenever possible to avoid pump damage.

Plumbing Installation

Preparations before Starting the Engine

1. Fuel: Check fuel level in tank. Do no over fill tank. Use fresh, 

clean automotive fuel. Note: 

DO NOT FILL FUEL TANK 

WHEN ENGINE IS RUNNING.

2. Engine Oil: Before checking or refilling with engine oil, 

make sure the engine is stopped and placed on a stable, 
level surface. Use oil recommended for ambient air 
temperatures that the engine will be running at. See 
chart below. Change oil according to manufacturer’s 
recommendation. (Once after the first 20 hours and every 
100 hours thereafter.)

2. Priming Water: 

IMPORTANT: PUMP MUST NOT BE RUN DRY. 

On self-priming pumps, only the chamber needs to be filled 
with liquid. The pump must not run unless the priming 
chamber is completely filled with liquid because there is a 
danger of damaging the mechanical seal, which depends on 
the liquid for its lubrication.
Self-priming models can be primed by removing the filler 
cap, located at the top of the pump where the discharge line 
is mounted to the pump, and filling the priming chamber 
with liquid. The priming chamber will fill to the level of the 
inlet port. After use, the priming chamber should be flushed 

and drained to avoid chemical corrosion and damage from 
freezing. Drain by removing the lower drain plug located at 
the bottom of the casing.

Starting the Pump

IMPORTANT: Before starting engine, be sure the priming 

chamber is filled with liquid and the discharge hose is secure. 

1. Turn engine switch located by recoil starter to ON position.
2. Turn the fuel cock to ON.
3. Push the throttle lever to a slightly open position.
4. Operation of choke lever.

When engine is cold:

In cold weather, start engine with choke in fully closed 
position.
In warm weather, start engine with choke in half- closed 
position.

When engine is warm:

Start engine with choke in fully open position.

5. Start engine by pulling recoil starter out quickly and 

forcefully. Repeat pulling until the engine starts.

Operation of the Pump

1.   Idle the engine for 3 to 5 minutes to warm it up.
2.   Open the throttle lever to the upper zone after engine

has warmed up.

3.   Once the pump has primed, you will note a load on the 

engine; adjust RPMs to proper speed for your pumping 
application.

Operation and Maintenance

Air Temperature

Single-grade Oil

85° F

#40W

60° F

#30W

32° F

#20W

Summary of Contents for GNP20C Series

Page 1: ...ure 140 F for pump and equipment being used 2 BEFORE SERVICING drain all liquids from the system and flush Remove the spark plug wire from the spark plug before servicing the pump or engine 3 Secure t...

Page 2: ...h engine oil make sure the engine is stopped and placed on a stable level surface Use oil recommended for ambient air temperatures that the engine will be running at See chart below Change oil accordi...

Page 3: ...ssembly process orientation and order of part assembly to ensure an easy assembly process 1 Pull spark plug wire off spark plug for safety considerations Remove the four bolts holding the casing to th...

Page 4: ...CLEAN AND LUBRICATED NEVER RUN THE SEAL SURFACES DRY 5 Place the key into the keyway of the crankshaft making sure it is seated properly Lubricate the crankshaft slightly with WD 40 LPS or equivalent...

Page 5: ...psed suction hose Suction inlet hose should be same diameter as inlet port fitting Check hose for kinks Blocked or clogged inlet Inspect basket strainer and clear any debris from screen Impeller plugg...

Page 6: ...11 2270 0112 Washer 12 4 19708 Hex Bolt M8x25 13 2 N A O ring 23x3 5mm 14 2 3240 0008 Plug 15 1 2404 0409 Outlet Flange 16 1 N A Check Valve 17 1 2404 0405 Inlet Flange 18 7 2210 0120 Hex Bolt M8x20 1...

Page 7: ...2 Washer 4 2250 0008 Hex Nut 1 1 N A Pump Body 2 2 N A O ring 23x3 5mm 3 2 3240 0008 Plug 4 6 2280 0006 T type Screw 5 6 N A O ring 5x2 65mm 6 1 N A Check Valve 7 1 N A 8 1 0402 1543 Impeller 9 1 N A...

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