Fuel Pump; Fuel System Contamination; Fuel Tank; Fuel Tank Removal - Gravely 915 Mini-ZT Service Manual

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.
1. Cable, Throttle
2. Key Switch
3. Clutch Switch
4. Mount, Fuel tank
5. Bracket, Fuel tank
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4
Figure 24
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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. Drain gas from tank.
WARNING: Fuel vapors are explosive and flammable.
Keep fuel in proper containers and clean up any spills
immediately. Handle fuel in well ventilated areas.
2. Remove bracket (Figure 24 ).
3. Disconnect gas line and attach to new gas tank.
4. Tank should pull off of the fuel tank mount.
Install Gas Tank
1. Attach gas line to new tank.
2. Push the tank onto the mount and secure with the
bracket.
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5
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