Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual page 316

PIPER CHEROKEE WARRIOR SERVICE MANUAL
Do not remove the buffer spring and valve from the plunger
assembly.
Do not tamper with seal at center of mounting bracket at side
of pump. It retains the dry gas which surrounds the electric
system in the upper portion of the pump.
4. Remove the washer, O-ring seal, cup valve, plunger assembly from the pump.
9-30. CLEANING INSPECTION AND REPAIR OF ELECTRIC FUEL PUMP.
a. Clean all parts with acetone or a suitable dry type solvent. If plunger assembly does not come
clean or there are any rough spots, polish gently with crocus cloth.
b. Inspect the pump for the following:
1. Check the filter screen for damage or distortion.
2. Gently touch the cup valve and check for freedom of movement. Do not disassemble.
3. Shake the plunger assembly and listen for clicks to indicate valve action.
4. On the late model pumps, check O-ring condition.
5. Check the condition of the cover gasket and plunger spring cup gasket.
c. Repair of the pump is limited to replacement of parts found defective during inspection.
Revised: February 28, 1995
CAUTION
CAUTION
Figure 9-10. Plunger Fuel Pump
2B4
Island Enterprises
FUEL SYSTEM