Piper Navajo PA-31 Service Manual page 632

PIPER NAVAJO SERVICE MANUAL
TABLE IX-II. TROUBLESHOOTING CHART (FUEL SYSTEM) (cont.)
Trouble
Cause Remedy
FUEL WARNING SYSTEM (cont.)
Fuel flow warning
lights illuminate
momentarily when
voltage is initially
applied to the circuit.
Normal operation of the
gated delay relay.
Fuel boost pump
warning light fails
to illuminate.
Bulb(s) burned out.
No power from bus.
Replace.
Check and reset the
gear, oil temperature,
and fuel quantity
indicator circuit
breaker. (If the
breaker is popped,
the fuel flow warning
lights have failed
also.)
Trace through system
for an open circuit
or faulty component.
Pressure switch
malfunction.
Replace.
Fuel boost pump
warning light fails
to extinguish.
Fuel boost pump
circuit breaker popped.
Fuel boost pump
malfunction.
Check and reset.
Check operation and
output pressure.
Pressure switch
malfunction.
Replace.
Ground in circuit.
Check circuit for
ground.
Reissued: 10/12/79
FUEL SYSTEM
3C16