PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 1
Nov 30/06
4K19
73-30-00
INDICATING
1. Fuel Pressure Gauge
The fuel pressure gauge on the PA-28-161, Warrior III is mounted in a 3-in-1 gauge 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
Figure 1 for data required to calibrate the fuel pressure gauge.
2. Troub
leshooting
See Chart 1.
CHART 1
TROUBLESHOOTING FUEL PRESSURE GAUGE
Trouble Cause Remedy
No fuel pressure indication. Fuel valve stuck. Check valve.
No fuel in tanks. Check fuel, fill.
Defective fuel pump(s). 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
intake lines.
Defective gauge. Replace gauge.
Tripped ENGINE GAUGE Reset circuit breaker. If
circuit breaker. breaker does not remain
set, check wiring and
components for short.
Faulty sender. Replace sender.
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 Remove and empty.
with fuel.
Air in line. Loosen line at gauge, turn
on electric pump. Purge
line of air and retighten.
High fuel pressure with engine Fuel in line expanding due to Normal.
shut off right after flight. heat build-up in cowling.
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