Question about 1998 GMC Sonoma

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After i replaced my fuel pump on 09 sonoma, now

The fuel pump in my 98 Sonoma failed. I replaced it and it ran fine for 3 weeks. Now when the truck gets warm ( 20 minutes ) it dies and acts like its not getting fuel. After it cools off its runs fine again until it gets hot.

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  • gdrake Jul 28, 2009

    I also changed the fuel filter. I was thinking it might be the ground but the problem seams to repeat at the same time when the car heats up.

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Did you replace the fuel pump connector at the fuel tank? this is a problem area, also have you had the system tested for trouble codes, also check the fuel pressure whren it acts up, it should be around 55-60 PSI, let me know what you find.

Posted on Jul 28, 2009

I would strongly suspect the ground for the fuel pump circuit.
I think it is located almost on the very end of frame. It is a ground splice pack. It'll be a small plastic "box" with 4 or 5 wires going in one end and then bolted to the frame. You could also check the fuel pump amperage draw, see if it is drawing too much current. That is how you could determine if the pumps are bad.
Check ALL the related wiring for the pump. From the underhood fuse box down all the way along frame to tank. Remove tank and check the connector where it plugs into pump assy. Make sure the pins are not spread out (terminal tension). And check the GROUND circuit.

Posted on Jul 28, 2009

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