Fuel Pump Pressure Check - Piper PA-24 Comanche Service Manual

"PER COMANCHE SERVICE MANUAL
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FIGURE 10'7.
EXPLODED VIEW BENDIX ROTARY FUEL PUMP
8-29. Fuet Pump Presaure Check.
1.
Carburetor Induction System.
a. The engine driven pump and the eleeuic pump<s) may be checked by using ehe pressure lage
in the inst'Nment panel or conneetiD, a
Pic
to the inlet of the carbumor.
b.
Check the operation of the en,inc driven pump with the tnJine operating from low thtu
high
rpm and the demic pump off.
c. The electric fud pump pressure may be checked with the en,me shut down and the electric
pump on.
d. A pressure reading for CftIine driven and electric pumps on the 0-360 and 0-"'-0 engines
should not be under 0.5 pounds not over 6 pounds. with a desired pressure of 3 pounds.
2. Fuellnjecnon System.
a. Fuel pressures of the engine driven pump and t'lectric pump may be taken by connecting
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pressure gl!e to the fuel line, at the inlet to the enpne driven pump and at the inlet co che injector,
opecatin, the engine and obscM"I the prCSlure readints as given in Table
yilt-I.
The electric fuel pump
must be operated
at
approximately 14 volts, therefore with the engine operating at idle. assiStance of one
cell fcom another battery .:onnecred in series may be
necessa~
to bring the voltage u!' to 14
v
olts,
FUEL SYSTEM
ISSUED: 8/18172
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