Piper COMANCHE PA-24-180 Service Manual page 679

Fuel gauge indicates full
when ranks are not full.
Fuel gpuge fails to
change indication when
selector handle is
moved
PIPER COMANCHE SERVICE MANUAL
TABLE XI-XIV. FUEL QUANTITY INDICATORS
Trouble Caus Remedy
Fuel puge fails to
indicate.
Broken wiring.
Check and repair.
Gauge not opentng. Replace.
Float partially or completely
filled with fuel.
Circuit breaker out.
Defective selector switch.
Replace float.
Rese and check.
Clean and check selector
switch.
Incomplete ground.
Selector switch slipping on
fuel valve shaft.
Check ground connections at
fuel transmitter in
wings.
Replace selector switch
Defective override switch
Determine which switch is
malfunctioning. reolace
switch.
Fuel
full.
Fuel
gauge indicates over Incomplete ground.
Fuel selector in "OFF"
position.
gauge indicates zero
Shorted connection at selector
switch or other wiring
Check ground connections at
fuel transmitter in fuel
cells
Normal.
Check switch and wiring
Refer to Section IX. Elec-
trical Svstem Diagrams
Check fuel cell and deter-
mine if
it
is coilaosed
If so. repair as necessar\
adiust filler cap to main-
tain right seal or replace
caD
Fuel gauge indicates fuel
when cell is emptr
Fuel cell is collaspng due
to a suction created bv
a loose filler neck cap
When tank is collapsed
fuel sender arm is held
in full position
INSTRUMENTS
ISSUED: 8/18/72
3618