Piper Navajo PA-31 Service Manual page 631

Fuel flow sensor
probe malfunction.
Gated delay relay
malfunction.
PIPER NAVAJO SERVICE MANUAL
TABLE IX-II. TROUBLESHOOTING CHART (FUEL SYSTEM) (cont.)
Trouble
Cause
Remedy
FUEL WARNING SYSTEM
Fuel flow warning
light fails to
illuminate.
Bulb(s) burned out.
Replace.
No power from bus.
Check and reset the
gear, oil temperature,
and fuel quantity
indicator circuit
breaker.
Trace through system
for an open circuit
or faulty component.
Check free movement
of probe tip; replace
if defective.
Replace relay after
the cause for the
white wire to ground
has been isolated
and corrected.
Fuel flow warning
light fails to
extinguish.
Low fuel level
in fuel cell.
Fill.
Fuel flow sensor
probe malfunction.
Ground in circuit.
Gated delay relay
malfunction.
Check free movement
of probe tip; replace
if defective.
Trace through system
for ground.
Replace.
Reissued: 10/12/79
FUEL SYSTEM
3C15