Fuel / Exhaust
4.36
Fuel Pump Maintenance
The fuel pump does not require any specific scheduled maintenance. However , the following should be observed:
S Output: The pump output may be checked by re-
moving the fuel supply line from the rear cylinder
carburetor (PTO end) and placing it into a container .
With the engine idling a steady small stream of fuel
should be observed.
S Cleaning: The pump and impulse line must be dis-
assembled and cleaned whenever water is present
in fuel (beyond separator) or in the engine.
S Impulse Diaphragm Inspection: Loosen clamp
and remove impulse line from pump fitting. Apply
5 PSI pressure to impulse line fitting. The dia-
phragm should hold pressure indefinitely. Remove
and inspect the pump diaphragms if the impulse
chamber does not hold pressure.
Disassembly/Inspection
1. Remove fuel pump body screws (4) and carefully
lift assembly from carburetor.
2. Remove gasket, diaphragm, and O-ring.
Carefully examine each for cracks, holes,
distortion or fatigue (stretching). Replace if
necessary.
3. Inspect the check valves in the fuel pump body.
The valve body cannot be disassembled and
must be replaced as an assembly if check valves
are damaged or bent.
Check Valves
Screws not
Removeable
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