Fuel Pressure Gauge - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
10-60. FUEL PRESSURE GAUGE.
10-61. GENERAL. The fuel pressure gauge instrument is mounted in the cluster on the instrument panel.
This gauge is connected to the fuel system at the injector fuel inlet fitting.
10-62. TROUBLESHOOTING.
TABLE X-XI. FUEL PRESSURE GAUGE
Trouble
Cause
Remedy
No fuel pressure
indication.
Fuel valve stuck.
Fuel valve off.
Check valve.
No fuel in tanks.
Defective fuel pump.
Defective gauge.
Check fuel, fill.
Check pump for pres-
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.
Replace gauge.
Pressure low or
pressure surges.
Obstruction in inlet
side of pump.
Trace lines and locate
obstruction.
Faulty bypass valve.
Replace.
Faulty diaphragm.
Replace or rebuild pump.
Needle fluctuation.
Surge dome on pump
filled with fuel.
Remove and empty.
Air in line.
Loosen line at gauge,
turn on electric pump.
Purge line of air and
retighten.
High fuel pressure
with engine shut off
right after flight.
Fuel in line expanding
due to heat build up
in cowling.
Normal.
10-63. REMOVAL AND REPLACEMENT. (Refer to paragraph 10-94 of this section.)
Reissued: 9/23/80
INSTRUMENTS
3B19