Fuel Pressure Gauge Troubleshooting - Piper PA-44-180 SEMINOLE Maintenance Manual

TROUBLESHOOTING.
CHART 7302. TROUBLESHOOTING FUEL PRESSURE GAUGE
Trouble
No fuel pressure indication.
Pressure low or pressure surges.
Needle fluctuation.
High fuel pressure with engine
shut off right after flight.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Fuel valve stuck.
No fuel in tanks.
Defective fuel pump.
Obstruction in inlet side of pump.
Faulty bypass valve.
Faulty diaphragm.
S u rge dome or pump filled with
fuel.
Air in line.
Fuel in line expanding due to
heat build up in cowling.
— END —
3F13
Remedy
Check valve.
Check fuel, fill.
Check pump for pressure build
up. Check diaphragm and relief
valves in engine pump. Check
for obstruction in electric pump.
Check bypass valve. Air leak in
intake lines.
Trace lines and locate obstruction.
Replace.
Replace or rebuild pump.
Remove and empty.
Loosen line at gauge, turn on
electric pump. Purge line of air
and retighten.
Normal.
Page 73-10
Revised: June 20, 1995
73-30-03