Question about GMC G1500

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New fuel pump didn't work to get the truck going....

1986 Chev 305 wrangler, fuel pump went the other day, replaced it, runs with gas in carb, but no amount of pumping the throttle will keep it running....wondering if it's the fuel line or filter, but doubt it....any other possibilities?

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  • jhudes Apr 18, 2009

    ****, it is....and that wouldn't be any good.....I had to dip into the rent money for the pump.

  • jhudes Apr 20, 2009

    yes, I've already checked it a few times, the pushrod is positioned correctly on the lever, changed filter (there was water in old filter), but battery was hooped from starting it so much, and it fried the jump start kit (jumper cables heated up when connecting it to car...way too much). Tried turning the motor to check cam shaft, too tight, couldn't get it to turn, I'll see if I can figure that out next week., going to get new battery (it was near the end of its life anyway) and see if I can get it to start. Tried operating pump by hand, no liquid gas, but fumes did get pumped through the line...maybe lines have too much air...

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IF it is a mechanical fuel pump...
Poss worn out Cam Shaft... not making the pump work!



Posted on Apr 18, 2009

  • IF you pull the pump off... you can reach and feel the pushrod. Turn the motor on by hand with a rachet... You should feel the pushrod move up and down.
    IF it moves up and down it iwll only move a half inch. You have to hold pressure on it. IF IT DOESNT MOVE... Then it is your Cam Shaft!

    IF IT MOVES... Try "Reinstalling" and try to make sure you get the pushrod on top of the arm.


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Well if the pump works then follow the pump fuel lines to the engine,you will find the fuel filter then replace it and will also see petrol if any in it ,if not pump isent working ,if dirty replace it and blow air back from carby to filter to clean out pipe
,turn on ign fuel should come to filter and then with new filter in turn on fuel and see if any comes to carby if ok it should start and run.
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