Piper Comanche PA-24 Service Manual page 648

PIPER COMANCHE SERVICE MANUAL
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FIGURE 1-'7. EXPLODED VIEW BENDIX ROTARY FUEL PUMP
8-29. Fuel Pump Pressure Check.
1. Carburetor (ndumon System.
&.
The engine driven pump and the electric pump(s) may be checked by using 'he pressure gase
in the instrument panel or connectinl a PIc to the inlet of the carburetor.
b. Check 'he opention of the engine driven pump with the engine operating from low ,hru high
rpm and the electric pump off.
c. The electric fuel pump pressure
may
be checked with 'he engine shu, down and 'he deemc
pump on.
d. A pressure reading for engine driven and electric pumps on 'he Q.360 and Q.HO engines
should no, be under 0.5 pounds no, over 6 pounds. wi,h a desired pressure of 3 pounds.
2. Fuel Injection System.
I..
Fuel pressures of the cnsinc driven pump
and
e-Icctric pump may be taken b\' connecting
1
pressure Ae to the fuel line, at the inlet to the engine dnvcn pur:np and at the Inlet to the injector.
operating the engine and observing 'he pressure readings as given in Table YUH. The electric fuel pump
must be operated
at
ilpproximately 14 yolts. therefore with the engine operating
a.t
idle.
1SS1stanCe
of one
cell (rom ilnother batterY
~onnected
in series may be necessary to bring the voltage
u~
to 14 ,,·olts.
2J12
FUEL SYSTEM
ISSUED: 8/1B/72