Fuel Quantity Indicators Troubleshooting - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL
TABLE XI-XIV. FUEL QUANTITY INDICATORS
Trouble
eau.
Remedy
Fuel gauge fails to Broken wiring. Check and repair.
Indicate.
I
Gauge not operatin,.
Replace.
Float partially or completely Replace float.
filled with fuel.
Circuit breaker OUt. Reset and check.
I
I
Defective selcttDr switch.
Clean and check selector
I
i
switch.
I
I
Fuel gauge indicates full Incomplete ground.
Check ground connections u
I
when tanks are not full. fuel transmitter in
wings.
I
I
Fuel gauge falls to Selector switch slipping on
Replace selector switch.
i
I
i
i
change indication when fuel valve shaft.
I
I
selector handle is
I
moved.
I
I
I
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Defective override switch.
Determine which switch is
i
I
!
malfunctioning. replace
I
I
switch.
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Fuel gauge mdicates over
full.
Fuel gauge indicates zero.
I
Fuel gauge indicates fuel
;
1
when cell is empty.
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!
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IIIlSTRUMENTS
ISSUED: 8/18/72
Incomplete ground.
Fuel selector in
"OFF"
position.
Shorted connection at selector
switch or other wiring.
Fuel cell is .:oUasping due
to
&
suction created
b~'
a loose filler neck cap.
When tank is collapsed
fuel sender arm is held
in full position.
3
818
I
Check ground connections
at
fuel transmitter in fuel
I
cells.
Sonna!.
Check switch and wirtng.
Refer to Section IX. Elec-
trical System Dla!Tams.
Check fuel cell ilnd deter-
mine if it is collapsed.
If so. repair as neeessarv.
adjust fillet cap to main-
tain tight seal or replace
"1p.