Question about 1994 Oldsmobile Bravada

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94 olds bravada 4.3 fuelinject.

Before, i could hear the fuel pump shutting down when i turned car off. all the sudden it stopped and it wouldn't start anymore. i tried changing the relay, but that didn't work. so i changed the fuel pump and it still isn't running. it has 2 wires ( pink and gray) that plug in and a ground wire. i'm getting about 11volts from the pink wire and approx. .03volts from the gray one. i can't find any bypass wire near the battery. nearly impossible to get at the oil pressure switch and what i think is the prime switch, although i'm sure which is which. one is directly under the distributer and one is towards the passenger side. any help would be greatly appreatiated.

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  • dan Nov 30, 2008

    i also jumped the old fuel pump on a battery and it worked, so i bought a new pump for nothing. i'm going to try replcing the wiring harness to see if thats the problem. thanks.



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1st check battery then batteries negative ground wire check for corrosian YES I KNOW you already checked that.Good now check negative ground wire connection to frame of vehicle OK Now check positive wire at Battery for corrosion in liettle Wire.Make sure ground wire to frame is not corroded and is tight.Maybe have some one wiggle the positive wires some when you try starting car!This could help if it sometimes works and sometimes not.Last check and switch fuse in fusebox with different fuse maybe it blew! Because wires at battery corroded or loose.Good fortune to you.

Posted on Dec 08, 2008

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Check your fuses under hood and under dash and if they are good it is possible to get a bad fuel pump or one that has the incorrect fuel pressure

Posted on Nov 30, 2008


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1 Answer

I have 2000 olds bravada with 4.3 l vortec.It just stalled on me driving down road.I turn key to listen for fuel pump, didn't hear it .What would make car not start? With no pump turning on?

maybe the pump is stopped from the fuel pressure being reached and the pressure switch turned it off
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First check the spark up at the engine. Also turn the key to the on position with out turning it over and listen and see if the fuel pump primes. You should hear it hum. Thats where I would start anyway. If you don't hear it prime, then the fuel pump is out. If it is running and you are getting spark, then you may have to hook up a fuel pressure gauge to it and make sure you are getting enough pressure.

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Check all the fuel lines and connections very carefully for leaks and condition. The pump may be drawing some air.

We assume you have the correct fuel pump for the vehicle, that it is operating normally, you have the correct fuel filter and that there are no obstructions in the fuel system as a result of the work carried out so far.

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Sounds like the fuel supply pipe inside the fuel tank has hole that's why if the fuel level is about 1/4 and the pipe hole is not completely soak in the fuel, the fuel pump will sucks air instead of fuel and this can cause of lack of power first until the engine shut off but if your problem is sudden shut off without other symptoms like lack of power or engine rough running first before engine shutting off, most probably it was electical problem.

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