Piper PA-24 Comanche Service Manual page 500

PIPER COMANCHE SERVICE MANUAL
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METHOD ONE METHOD TWO
FIGURE .. g. otECKING SENDER UNIT FIGURE ..
,0.
CHECKING fUEL
GAUGE
(a) Connect an ohmmeter to the sender uftit.
(b)
P~ition
tbe float arm a..irllt its bottom stop and ascertain the ohauneter indicates
0.00 to 0.50 oluDa resistance.
(c) Slowly move the floet arm from the
bottOlll
stop to the top stop. The ohmmeter needle
should steadily move I!P the scale. without fluctuation, .. the f10Itt arm is moved.
(d) With the float .rm .pillSt its top stop, the ohmmeter should indicate 29.6 to 31.3
ohms resistance.
If incorrect resistance or fluctuation
is
found, the .ender should be repl.ced.
c. Wiring Check.
1. Check all IroWld connections throulhout the indicatinl system for conosiOll or loose
connections that may cause excaasive resist.nce in the circuit.
2. Check all.plice. and terminal connections for corfOlJion and .ecurity.
3. Check Wiring betwe.n connections for uces.ive resiatance dlle to frayed or broken
strands.
d. G.llge Check.
1. Sender Method:
(a> Position and secure a calibrated sender to the fabricated checking jig.
(b)
Connect the sender directly to t.M gaUle beinl checked usina Number 16 or larger
wire. (Refer to FiINre 8-10.)
(c) Connect a 14-YOlt power supply to tbe electrical system 01 tbB .Up"ne.
(d)
Operate the power supply and mOve tbe .ender noet .rm tlvolllh ita travel. As-
certain that the empty and full pcMitiaal 01 tbe sender aad
the
lallie cone.pond.
If
not. the
lallge should be
,.plac~.
2. Resistor :'ftethod:
(a> COIlaect a 15-ohm resistor to tbe ..ader Wlit terminal of tbe laule beici cheeked.
(Refer to Figwe 8-10.)
FUEL SYSTEM
ISSUED: 8/18/72
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