Question about 1997 GMC Sierra

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I replaced fuel pump on 1997 gmc 1500 5.7 liter. The truck now skips on acceleration and makes a whistling sound

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Check for a vacuum leak and replace your fuel filter.

Posted on Jun 20, 2009


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My 1996 mercury cougar xr7 4.6 liter engine begins to shudder when accelerating reaches 30 mphfault codes read 1717 and 174

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I have a 99 GmC Suburban, an it had the same problem, I replaced the fuel filter, still had same problem, then I replaced the fuel pump, that fixed the problem for one year, I had to replace it again, this makes my third replacement, the first two pumps mad a whistling sound all the time, the last pump did not sound at all it seems the pump was improved, also came with a new and better connector.hope this helps...

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Hello. The GMC Sierra has an electric fuel pump so you should ensure that its fuses and relays are working before checking it. You may need to clean your fuel pump or replace it if your gas tank is not empty, but your vehicle has difficulty getting fuel. The GMC Sierra comes in a variety of styles and trim levels that can affect the replacement fuel pump you choose.

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1 Answer

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1 Answer

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Spray salty water on your ignition components. they may ARC or cause worse missfire.(salty water is a better cunductor than regular water) these have high failure rates on caps rotors, wires for whatever reason. the O2 sensor may be a result of the missfire. if you want to swap around some wires to see if the missfire follows you could do that as well. if it follows you need wires. if it stays i would go with cap and rotor.

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HI. Had the same problem and searched for months. its pump injectors. You re looking for 1500$ part and 400$ labor.

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