Piper Navajo Chieftain PA-31-350 Service Manual page 550

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE IX-IV. TROUBLESHOOTING
CHART (FUEL SYSTEM) (cont)
Trouble
Cause
Remedy
No fuel pressure
Defective fuel pump.
Check pump for pres-
indication. (cont.)
sure build up. Check
diaphragm and relief
valves in engine pump.
Check for obstruction
in electric pump. Check
bypass valve. Air
leak in intake lines.
Defective gauge.
Replace gauge.
Pressure low or
Obstruction in inlet
Trace lines and locate
pressure surges.
side of pump.
obstruction.
Faulty pump.
Replace.
Unidentified leak.
Fuel lines damaged or
Locate and repair or
improperly installed.
tighten.
O-rings improperly
Locate and repair or
installed.
tighten.
Fuel valve leaks.
Worn O-rings.
Replace O-rings or
valve.
Reissued: 9/23/80
FUEL SYSTEM
2L15