Truck sat for 2 yrs ... upon trying to start fuel pump would not remain running . sometimes runs for a few seconds to a few minutes and some times runs for an hour. but will not remain running. once fuel pump stops hit or miss if turning ignition will start pump again. replaced: fuel pump, fuel pump relay, fuel filter, fuel strainer, and ecu
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Re: fuel pump not staying on 1993 k1500 350
Some GM products also incorporate the oil sender switch into that circuit for fuel pump, so that in case of an accident, engine shuts off, oil pressure drops, in turn, shuts off power to fuel pump. May be worth a look at what your getting for oil pressure, as well as checking switch/sender.
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OK, when you turn the key to on, it will start the pump for about 2 seconds-this is just to put pressure in the lines and in the fuel rail for easy starting. If key is not turned to start, pump will shut off after 2 seconds. But when cranking in start, and when engine is running, the pump is on full time.
If your pump runs longer than 2 seconds with key only in on position, you have a fuel circuit problem. It very well could be a bad fuel pump relay staying on. Or it could be a computer problem signaling the relay to stay on longer. Try a new fuel pump relay first and see if that was the problem.
It could be a bunch of things, but let's assume it is the fuel, Water or crud in the gas tank will usually make the engine just cut right out and come right back, If it runs some what, and you can hear the fuel pump come on when you turn the key, the fuel pump should be ok, only a pressure test will tell you more. Fuel filter might be clogged, but the fuel sitting in the carb for five years is the biggy. It dries out and turns into rock, especially in the jets, the bowl usually turns into jelly, I would get some gas treatment in the tank, and some carb cleaner in the spray can, this is the easiest way to fix it if it does anything at all. Run the fuel through if you are driving it, and take the air horn or filter off and spray in the carb cleaner with the engine running. If you don't notice a big difference, I would go ahead and get the carb rebuilt or replaced with a used one or new, whichever. Sometimes the cleaner will do the trick. Check it out.
fuel pump relay switch which will cause fuel pump to also become week had same problem for three yrs. My husband, every mecanic in country thought i was crazy, cuz never did it and i mean never when I took it to shop, was so flustrating, untill finally one day my husband was with me when it done it. I said finally damn car tryed make me think I was crazy, i said believe me now, said yeah, **** He drove it all time to but never in those three yrs did it ever do it to him, me on the other hand everytime i drove it just about, so i think he thought i was crazy or just wanted a different car and im like no just want mine fixed so i didnt have to take it for a walk everyday instead i would like to driving it cuz everytime i left the house in those three yrs i was usually walking back, or hitching a ride, my car walked me very often lol, That was 5 yrs ago have never had a problem with the car since, still driving it today.