I've got an '89 Firebird with a 6 cylinder 3.8. When I bought the car 2 months ago, the guy said it had a brand new fuel pump but it didn't need it after they changed it. He said there is an inline fuse under the body that keeps blowing.
The car ran great, then one day the fuel pump quit working. I can't hear it hum when I turn the ignition on and I have no fuel to the injectors.
Is there any truth to the inline fuse or is the pump out? I'd like to know before I drop the gas tank and spend $70 on a pump I may not need.
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Re: Fuel pump keeps failing
Check the fuel pressure first with a gague the pressure should be at 40-47 psi
does any other things stop working when the pump stops?
it sounds like you have a short to ground in the fuel pump circut, check the circut for any chaffed wires.... there is a fuse in the fuse box there is not supposed to be one on thr frame rail
another possibillity is a clogged fuel filter making the pump work harder and overheating
check pressure wires and replace the filter one of these is your problem
let me know dant forget to rate me
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How long since a tune-up? Include air filter, fuel filter, gas injector cleaner...Also check the Idle Air Control valve on your 3.4 V-6...It can be dirty or clogged over time...Located on the air intake plenum...your auto parts store can also show you a diagram...Fuel pressure must be constant also, your Firebird is worth having the fuel pressure regulator checked, as well as the fuel pump...
I don't know why its not fuel efficient. But the fuel pump is inside the fuel tank. you should not attempt to replace it yourself, and don't change it on a whim. prove that's its bad, its an expensive guess.
possibility that's it's the pump, the fuel pump relay, check the relay and pump for power/ground etc. Although you changed the filter 6 months ago i wouldn't X that as a possibilty, i always try to change parts with Ac Delco or another OEM equivalent brand. Could also be injectors, test the resistance at each one, however if none are giving gas then it's extremely rare that they all died at once.
Your truck is going into "limp home mode". Their is a problem with the fuel injection system. quite a few possible causes. possibly 1. pressure regulator failing. 2. fuel pump failing to provide proper pressure. 3. fuel filter 4. fuel line partial blockage between the tank and the fuel injection pump. There may be other causes and the items I mentioned can be difficult to check out. Good Luck!