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My truck starts but will not run new feul pump new injection spider I pour gas in throttle body and it runs perfect

What could cause this

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Check the fuel filter or replace it as it doesn't cost that much and check the pressure regulator to the spider. Hope this helps.

Posted on Apr 22, 2017

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My Chevy 2500 p/u will only start and run when I pour gas in the carb...if I kill it for 2 minutes , I have to do it again to get it started ...uhg..frustrating !!! One guy told me it was a spider sumthing...


Lets start with terminology. I am assuming the truck is newer than 1987 so you would have fuel injection. No carb.
If it is a vortec engine, either a 4.3 or larger, and built after 1993, it could have central port fuel injection. That style uses one injector and a spider of lines that go to each intake port. This is inside the upper intake manifold.
Vortec engines require more fuel pressure than engines with port fuel injection or throttle body injection. So the first thing you need to do is check base fuel pressure before and after you crank the engine. You'll need a pressure gauge to do it. Normal fuel pressure at idle for a port injected engine is 35psi and 60psi for a central pfi system.

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87 chevy 350 tbi will only start if if pour gas in the throddle body then keep it running by pumping the peddle. It seems to starve at higher rpms, and when it does idle the rpm's swing from hig


Sounds like the fuel pump is going bad(or in this case,has gone bad). I suggest that you change the fuel pump and use a fuel cleaner in your gas tank as dirty gas may have caused the problem to begin with.

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1 Answer

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So you know it is not getting fuel thru the injectors.
Have you checked fuel pressure at the rail, and do you know if the pump is running when you turn the key on ?

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start checking fuel pressure easier then changing pump re check that all is plugged in by air cleaner

Mar 10, 2010 | 1988 GMC S-15

1 Answer

Wont start,pour little fuel in throttle body runs 4 little, changed fuel filter,psi seems good off fuel pump


The injecters may be bad, or not getting power.Check wires to injecters @ throttle body to make sure they have not rubbed bare .

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1 Answer

99 silverado 4.3 vortec. engine turns over rapidly. plenty of spark. fuel pump runs. fuel filter not clogged. when i pour gas into the throttle body it runs until that gas runs out. what gives?


put a fuel pressure gauge on it. Check my specs because I am doing this from memory but I think it has to have at least 61 psi and anything below about 55 is not enough. I once put a brand new from the dealer on my bravada. Abter it still did not start I replace the "injector spider" to the tune of 400 buck my cost for the part only to find that the brand new feul pump was not getting enough pressure. Section 4 in a haynes manual at the parts store will give you the minimum fuel pressure.

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