Auxiliary Fuel Pump System Operational Check - Piper ARROW III Service Manual

9-20b. AUXILIARY FUEL PUMP SYSTEM OPERATIONAL CHECK.
a. Install a calibrated fuel pressure gauge in the fuel line between the electric fuel pump and the engine
and disconnect the electrical leads to the manifold pressure switch located on the firewall.
b. Turn all cockpit controllable switches off. WARNING Due to possible fuel overflow, conduct this
operation is a no-smoking, well ventilated area.
c. With the master switch in the on position, place the electric fuel pump switch in the LOW position.
The calibrated fuel pressure gauge should indicate a pressure increase, indicating pump operation. The
pressure should not exceed 10 psi.
d. Set electric fuel pump switch in the HIGH position. Record the pressure indicated on the calibrated
pressure gauge. The pressure on the gauge should be higher then that recorded in step c but not more
than 24.5 psi.
e. Switch off Master Switch and reconnect leads to the Manifold Pressure Switch.
f. Ascertain that the fuel pump switch is still in the HIGH position and return the master switch to the on
position. Record the pressure registered on the calibrated pressure gauge. The pressure attained in this
step should be higher than that recorded in step d, but not in excess of 37 psi.
g. Place the fuel pump switch in the off position and depress the prime switch. Record the pressure
indicated and check against that recorded in step d. The pressure attained in this step should be higher
than that recorded in step d, but not in excess of 37 psi.
Revised: 2/13/89
CHEROKEE ARROW III SERVICE MANUAL
THIS SPACE INTENTIONALLY LEFT BLANK
2E22
FUEL SYSTEM