Piper Navajo PA-31 Service Manual page 630

PIPER NAVAJO SERVICE MANUAL
TABLE IX-II. TROUBLESHOOTING CHART (FUEL SYSTEM)(cont.)
Trouble Cause Remedy
No fuel pressure in-
dication (cont.).
Defective fuel pump. Check pump for pres-
sure build up. Check
diaphragm and relief
valves in engine pump.
Check for obstruction
inelectric pump. Check
by-pass valve. Air
leak in intake lines.
Defective gauge. Replace gauge.
Pressure low or pres-
sure surges.
Obstruction in inlet side
of pump.
Trace lines and locate
obstruction.
Faulty pump.
Replace.
Locate and repair or
tighten.
Unidentified leak.
Fuel lines damaged or
improperly installed.
"O" rings improperly
installed.
Locate and repair or
tighten.
Fuel valve leaks.
Worn "0" rings.
Replace "0" rings or
valve.
Reissued: 10/12/79
FUEL SYSTEM
3C14