I had a problem with the fuel pump coming on a couple of times on hot days. i replaced it this past weekend and the issue came back. one day when i was having the problem, my uncle suggested i vent the gas tank (loosen the gas cap). i did and the car started right up. i assumed it was vapor lock, so i kept my gas cap secure but not snug. i'm having the same problem again today, only the weather is cool and rainy and the gas tank is vented. i can't hear the fuel pump kick on.
Fuel pump operation on your impala is controlled by the computer. It activates the fuel pump relay when ignition is turned on, but only for a few seconds. This is called the fuel pump prime. When the computer senses a crank signal (upon start up) it will activate the fuel pump relay constant. I have found more problems with the fuel pump relay than anything. Vapor lock will not cause a no start unless it is in the fuel lines. GM systems use the manifold air temp sensor to allow for quick starts when hot......increases fuel injector on time. An intermittant fuel pump relay or bad pump will cause a no start any weather.
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First take the idle air control valve off and clean it with a non-chlronated brake cleaner then reset the computer.If problem still exists then check your fuel pressure it could be a weak fuel pump.If its not within the specs then replace fuel filter and pump.
This could be leaking fuel injectors, a stuck Fuel Pump relay, and/or faulty fuel pressure regulator. Have you had any of these items checked and/or replaced? If not, it may be time to replace them. Also, check your fuel filter. If it hasn't been replaced in the last year, replace it.
It is quite possible that your fuel gets cut off when the engien gets hot. So when the fault occurs- or let it idle for over 30 minutes to find it stalling - then check for the fuel filter block, fuel pump failure of the diaphragm. It will be better to replace and test once you find that the fuel flow reduces on heating of the pump. If not please check your HT coils for failure at higher operating temp. touch on the coils to see if it is hot.In such case the insulation would be low and needs an replacement as it fails to deliverr high temsion voltage. Hope this helps. Good day
The hardest part about replacing the fuel pump is wrestling down your fuel tank.The pump is inside of the tank and requires tank removal.As long as you own a couple of jackstands and a floor jack, you will have a fairly easy time replacing the pump itself.This should take the weekend warrior about four to five hours labor time.I hope I could help!!! Thanks for using Fixya!!!
two things to check, when was the late time you had a tune-up done ??? next, get a fuel pressure tester. hook up to the fuel rail. key on, engine off, pressure could be at least 35 - 45 PSI. get a hanes manual #59010. it will help you troubleshoot. fuel filter is a good place to start. should replace filter every 2 years.
CHECK SHRADER VALVE ON FUEL RAIL FOR PRESSURE. IT IS COMMON FOR PUMP'S TO GO OUT. YOU CAN HAVE SOMEONE LISTEN TO TANK FOR A BUZZ NOISE ON KEY CYCLES OR TEST FUEL PUMP CONNECTOR HARNESS FOR POWER. TRY KEEPING AT LEAST QUARTER TANK AT ALL TIMES TO KEEP FUEL PUMP COOL,SOME PEOPLE DRIVE ON LOW AQLL TIMES AND KEEPS PUMP HOT CAUSING PREMATURE FAILURE.
Take passenger side rear wheel off and look up at fuel tank & you will see where fuel pump & sender are in tank. Filter should be in that area, just follow lines from sender/pump lines, along frame rail I believe. Best thing to do is on a hot day, which is usually when it will act up the most, and when it starts to spit & sputter, take it & have fuel pressure checked. You can also remove air intake hose from throttle body & spray WD-40 into throttle body with plate open, and if it starts, but wouldn't before the spray, it's probably fuel pump replacement time. I think pump will come out if you just loosen tank straps & lower the tank enough to get it out. Lift & turn .