Question about 1996 GMC Sierra

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96 GMC pickup w 350 engine, starts hard after like 8 hours.

Hi, my pickup starts hard after it has sat for like 4 hours. Ive changed the spark plugs, rotor, rotor cap, fuel filter. Will start after about 5 to 6 cranks, then runs fine. Fuel filter was replaced like 4 yrs before this one. Its like it maybe doesnt have enough pressure. Might you have any other ideas. I put a pressure gage on it and that seems to be ok. Might you have any other ideas?? Also put a k&n air filter on it. thanks, Mike

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Could be your fuel pump relay you should check to see if the pump runes for about 3 sec. when you turn the key to the on position. It should if not the oil switch is turning on the pump after you achieve pressure.
if not check the relay. also with the pressure gauge hooked up check if your pressure drops off fast after you turn off the car. if so you need ether a pressure reg or a fuel pump.
hope this helps

Posted on Jun 20, 2009

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Posted on Jan 02, 2017

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