Piper Warrior III - Page 411

PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 3
Nov 30/06
2J13
28-00-00
CHART 1
TROUBLESHOOTING FUEL SYSTEM
Trouble Cause Remedy
Fuel will not flow. Blocked fuel line. Flush fuel system.
Blocked cap vent. Check and clean cap vent
hole.
Mechanical or electric fuel Check and replace if
pump failure. necessary.
Fuel selector not Check selector position
in proper position. and adjust if required.
Fuel selector valve damage. Replace fuel valve.
No fuel pressure reading. Fuel valve stuck. Check valve.
No fuel in tanks. Check fuel level and fill.
Defective fuel pump. Check pump for pressure
build up. Check diaphragm
and relief valves in engine
pump. Check for
obstructions in electric
pump. Check bypass valve.
Check for air leak in intake
lines.
Defective gauge. Replace gauge.
Fuel selector not in Check selector position and
proper position. adjust if required.
Pressure low or pressure Obstruction in pump inlet Trace lines and locate
surges. side. obstruction.
Faulty bypass valve. Replace.
Faulty diaphragm. Replace or rebuild pump.
Unidentified leak. Fuel line damaged or improperly Locate and repair or
installed. tighten.
Fuel valve leaks. Worn O-rings Replace O-rings or valve.