Ot 94 chev diesel

Anonymous-0 · Jan 26, 2011

Have no power to electric fuel pump. Have changed out the relay with no results. No power to inline fuse holder. Where do I go from here?

bison · Jan 26, 2011

Power to the liftpump is only in start mode.
When the truck fires the OPS(oilpressure switch)takes over running te LP.
One wire to the OPS is allways hot(key on or off)
the OPS fails frequently,i think that is your problem.
The OPS is located on the bellhousing under neath the glowplug controller.PITA to get at

Jump the fuel relay Pass front pin to center rear pin.It should run the LP.if not then you got an open some where between the LP and relay.
Check and clean the LP ground,it grounds at the stud on the pass side rear of head close to the fire wall

bison · Jan 26, 2011

Grounding the fuse to the groundstud next to it should run the LP too

bison · Jan 26, 2011

The LP could be shot too,happens often.

Anonymous-0 · Jan 27, 2011

Am going to check that right now Thanks for the reply

Ot 94 chev diesel

Anonymous-0

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bison

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bison

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bison

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Anonymous-0

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