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10.2 FUEL PUMP
The impulse style fuel pump is the most commonly
used fuel pump. Impulse fuel pumps may either be
mounted externally onto the carburetor fuel inlet or
remotely mounted. These pumps are connected in the
fuel line between the fuel supply and the carburetor or
directly to the fuel inlet.
Impulse fuel pumps are operated by crankcase
impulses created by the up and down movement of the
piston. A hose called a pulse line connects the fuel
pump diaphragm chamber and transmits the impulses
to the pump diaphragm. The impulses actuate the
diaphragm and the flap valves to lift the fuel from the
fuel tank to the carburetor.
10.3 FUEL SYSTEM CONTAMINATION
Any time fuel contamination is found in the fuel system
(dirt, water algae, etc.) replace the fuel, fuel filter and
flush the fuel lines. Remove the carburetor bowl and
clean. Replace all items that cannot be cleaned.
Reassemble the fuel system and check for proper
operation.
10.4 FUEL TANK
The fuel tank is made of composite material for long life
without breaking down from the additive used in
today’s blended fuels.
10.5 FUEL TANK REMOVAL
1. Remove deck for easy access to gas tank bolts,
referring to
Deck Removal
.
2. Remove front plate and disconnect battery ground
wire.
3. Remove engine cover
4. Remove left side shroud, unhook two rear idler
springs.
5. Remove belt from engine sheave. Double idler
assembly may be removed for better access to
engine bolts.
6. Disconnect all engine wiring, throttle and/or choke
cable and gas line from engine. (Drain gasoline
back to gas tank.)
7. Remove engine bolts and remove engine. Remove
four gas tank bolts and remove gas tank.
Disconnect gas line and attach to new gas tank.
8. Install gas tank. Position as far back in the slots as
possible before completely tightening gas tank
bolts.
9. Reinstall engine, wiring, gas line, and throttle
cable.
10.Install double idler and belt. Hook up double idler
springs. Install left side shroud, engine cover, and
mower deck. Connect ground wire to battery and
install front access plate.