Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual page 353

PIPER CHEROKEE WARRIOR SERVICE MANUAL
10-52. FUEL PRESSURE GAUGE.
The fuel pressure gauge instrument is mounted in the cluster on instrument panel. On the PA-28-151,
Warrior and PA-28-161, Warrior II, the gauge is connected to the fuel system at the carburetor fuel inlet fitting.
The fuel pressure gauge on the PA-28-161, Warrior III is also mounted in a cluster on the instrument
panel. Pressure information is transmitted electrically to the fuel pressure gauge by a sender unit clamped to
the upper left engine mount. The sender unit is connected by an independent fuel line, to a tee fitting at the
carburetor inlet, where it can sense the pressure of fuel entering the carburetor. Refer to Table X-IV and Figure
10-8 for data required to calibrate the Warrior III fuel pressure gauge.
10-53. TROUBLESHOOTING
TABLE X-XIII 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.
Revised: February 28, 1995
CAUSE
Fuel valve stuck.
No fuel in tanks.
Defective fuel pump(s).
Defective gauge.
(Warrior III). Tripped ENGINE
GAUGE circuit breaker.
(Warrior III). Faulty sender.
Obstruction in inlet side of pump.
Faulty bypass valve.
Faulty diaphragm.
Surge dome on pump filled with
fuel.
Air in line.
Fuel in line expanding due t o
heat build-up in cowling
2C17
Island Enterprises
REMEDY
Check valve.
Check fuel, fill.
Check pump(s) for pressure
buildup. Check diaphragm and
relief valves in engine driven
pump. Check for obstruction in
electric pump. Check bypass
valve. Air leak in in take lines.
Replace gauge.
Reset circuit breaker. If breaker
does not remain set, check wiring
and components for short.
Replace sender.
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.
INSTRUMENTS