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FUEL PUMP GENERAL INFO 94-97
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The 94-97 7.3L PSD fuel pump is
located in the engine valley behind the
fuel filter bowl and is a mechanical pump that has a
lifter that is operated by
the camshaft.
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It
is a triple action pump in that it has a diaphram section and 2 pistons.
The diaphragm provides the suction or
"lift" to the fuel from the tank and delivers
the fuel to the
drivers side piston.
This piston pumps the fuel through the
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filter at about 10 psi and delivers the fuel
to the passenger side piston which
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pumps the fuel out to the fuel rails at about
50 psi at idle.
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Probably the number one reason to
replace this pump is fuel leaks.
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It
can be difficult to find a leak on the pump but the use
a of telescoping mirror
works.
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Three places to look are:
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1. The main crimp on the pump body
which is about 3 inches in diameter.
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2.
Weep hole number one.
While leaning
over the radiator, feel under the crimp, in
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front of the passenger side piston tower.The hole is about 1/8" in diameter, is
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aiming down and should be dry.
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3. Weep hole number two.This one aims at the passenger side and is
right at the base
of the pump where it goes into the block, it should be dry.
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It
is important to eliminate all fuel leaks as they can cause bubbles in the
fuel which will
shorten pump and / or
injector life.
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FUEL PUMP
GENERAL INFO 99-03
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The 99-03 7.3L PSD fuel pump is
located on the drivers side frame rail and is an electric pump.
Pressure reading will be needed to diagnose
this pump unless it won't run and it has voltage.
If the fuel pressure for one bank is lower
then the other
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replace the check valve
for that bank.
To eliminate the fuel
pressure regulator,
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check fuel pressure before and after the FPR.
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