Question about 2001 Oldsmobile Bravada

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I have a 2001 Bravada. The vehicle will crank and turn over but it wont start. I have replaced the cam shaft sensor and the fuel pump relay and the rotor bug. I dont think it is the fuel pump because i can get it started by pour some berrymans in the air intake on top of the engine. I was wondering if there is a check valve on the fuel line that is allowing the fuel to seem back to the tank?????? Im dying here and refuse to buy a fuel pump because i dont think its the problem.

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  • leo78lion Sep 06, 2009

    I guess i dont understand how it could be the fuel pump if when i get the engine running it stays running and i have no more problems.

  • leo78lion Sep 06, 2009

    I can hear the fuel pump when i turn the key on. also like i said it saounds great when i get it started. I needs thoughts other than fuel pump.

  • leo78lion Sep 06, 2009

    OK i drive 20 miles to work after i get it started. I honestly dont believe it is the fuel pump. I dont think a little berrymans is going to keep it running that long. I can hear the fuel pump fine and the engine runs great for as long as i need it to once i get it started. Problem is ten hours later when im ready to leave work or first thing in the morning when im ready to go to work it wont start. When i get it running it runs like a champ.

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Ok... Wait we have to settle some things here. You can get the vehicle started by pouring fuel down the throttle body, if so then it is most definatley a fuel pump problem. I usually try to bang on the tank with a rubber malle while cranking the engine. if it starts then its the pump, the simplest way to check is to see if your getting power at the fuel pump assembly. If you are then you need to change the pump the power wire is the grey one on the tank.

Posted on Sep 06, 2009

  • Xander  Kravitz
    Xander Kravitz Sep 06, 2009

    I don understand all this confuion here. the car needs three things to run, spark, fuel and compression of the air fuel mixture, if you are adding fuel, or a fuel substitute such asberrymans carb cleaner or starting fluid then you have a fuel problem. regardless if you have fuel pump movement there is no way it is putting out enough pressure or enough flow, check the pump pressure at the scrader valve on the fuel rail. next you have to check the fuel volume. I am telling you this is going to be a fuel pump problem. you are just dancing around the problem and not solving it check pressure and check flow and when you see one of them is off . Replace the fuel pump.

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Replace the fuel filter. If that does not help, the have a fuel pressure test run on the fuel system. You may end up finding out that the fuel pump is weak and indeed needs replacing.

Posted on Sep 06, 2009

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You need 55 psi to start the vehicle but only 45 psi to run it.This is a high pressure fuel pump.So put a fuel pressure gauge on the fuel line under the hood to see what the fuel pressure is .This is why it will drive once you get it started by other means :)

Posted on Sep 06, 2009

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Turn on the key to the start position without actually trying to crank it over. leave the key in and go to the rear of the car and remove the gas cap. you should hear a noise best descibed as a buzzing noise. if you don't hear it the fuel pump has likely failed

robert

Posted on Sep 06, 2009

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I just recently had a problem with a 94 Integra, It would crank over but not start. The car sat on a slope for 3 days so the fuel was no where near the injectors when youd crank it. I ended up flooding it and when i got it started it smoked for a bit. I thought it was the fuel pump because if a car sits for a couple days and does this that is not reliable. Anyways a week later down the road I replaced the Main Relay Switch and the problem is now fixed. No more problems with starting! I think your main relay switch could have crapped out and that would have a great impact on the problems you are describing!

Posted on Oct 01, 2009

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If YOU are pouring something into the intake, then the fuel pump is taken out of the picture. Take the gas cap off. Put your ear to the filler neck. Have a friend turn the car on to the ignition position, not start. If you hear a humming, the fuel pump is working, if no noise, it is not working. If not, check the fuses, and the emergency fuel pump shutoff (usually shuts off in accidents). Any one of these could be the problem. Check battery cables, to make sure they are tight and not corroded. Ground wires could be a problem as well, inside the engine compartment and inside the car near the firewall, under carpet.

Posted on Sep 06, 2009

  • Rob Sep 06, 2009

    I think I see now, with the berryman's, it stays running, that was not clear to me in the original, sorry. I have a 94 Buick Lesabre, with 3.8. For a couple years now, you have to crank it for a couple seconds, then pump the gas pedal a couple times (while still cranking). I know you are not supposed to pump a car with fuel injection, but mine will crank all day long if you don't, no kidding! After it is warm, no need to pump it to start, only when it is cold. The kicker is, I dunno why it is like that! See if that helps.

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