2. Ensure that fuel shutoff valve is in OFF position.
3. Disconnect fuel lines from inlet and outlet sides of pump.
4. Remove nuts and bolts securing pump to forewall and remove fuel pump.
DISASSEMBLY OF ELECTRIC FUEL PUMP
Repair of the pump is limited to the fuel reservoir area only, as the electrical system is sealed. (Refer to
figure 28-4.)
1. Cut safety wire and remove bottom cover, gasket, magnet, and filter screen from pump.
—CAUTION—
If the screen does not come out be careful removing it from pump
housing to prevent damage.
2. Remove retainer spring from plunger tube using thin nose pliers to spread and remove ends of retainer
from tube.
3. Remove washer,O-ring seal, cup valve, and plunger assembly from the pump.
—CAUTION—
Do not remove buffer spring and valve from plunger assembly.
—CAUTION—
Do not tamper with seal at center of mounting bracket on side of
pump as it retains dry gas surrounding the electric system in the
upper portion of the pump.
CLEANING, INSPECTION AND REPAIR OF ELECTRIC FUEL PUMP
1. 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.
2. Inspect pump as follows:
a. Check filter screen for damage or distortion.
b. Gently touch cup valve and check for freedom of movement. Do not disassemble.
c. Shake plunger assembly and listen for clicks to indicate valve action.
d. Check condition of aring.
e. Check condition of cover gasket and plunger spring cup gasket.
3. Repair of the pump is limited to replacement of parts in the reservoir found defective during
inspection.
RESISTANCE CHECK (PLUNGER TYPE PUMP)
To check the resistance of the pump, connect an ohmmeter to the lead wire of the pump and the pump
body. For a 12-volt pump, a reading of 4.87 to 6.4 ohms should be obtained.
28 - 23 - 00
Page - 28-09
Reissued: August 1, 1986
2B3
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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