Question about Pontiac Trans

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I have a 91 trans am 5.0 litter.....if the fuel pump regulator is meesed up will it drop pressure when then fuel pump kicks off

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  • Andrew Hart
    Andrew Hart Apr 23, 2010

    so wats another way i can tell if the fuel pressure reg is messed up

  • Andrew Hart
    Andrew Hart Apr 23, 2010

    is there any way u can test it?

  • Andrew Hart
    Andrew Hart Apr 23, 2010

    what ways can i tell if my fuel pressure regulator is bad?

  • Andrew Hart
    Andrew Hart Apr 23, 2010

    im a mechanic i no how to remove a fuel pump thnx anyways...and i have replaced it 3 timnes now....and i mean when the key is on and the fuel pump builds up enough pressure nd kicks off...if the pressure starts dropping could that be the regulator.....i have checked and changed everything on this damn car exept the regulator...and it runs like it either getting to much gas or not enough

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No this will not cause the fuel pump to turn off, i suspect you have a defective fuel pump, the regulator is a simple mechanical deivce and has no electrical connection to the fuel pump circuit, u are describing a classic symptom of a failing/defective fuel pump, in order to replace the fuel pump u must remove the differential assembly drop the gas tank out and replace the pump that is located inside the fuel tank, u really need a car lift to do this, it darn near imposs on the ground.

Posted on Apr 23, 2010

  • yadayada
    yadayada Apr 23, 2010

    disconnect the vacuum to the pressure regulator, if the pressure goes up it is good, but really the only symptom i have ever seen is that they leak fuel through the vacuum port at the regulator. I am very familiar with this car, owner one for 18 years, have had it apart end to end, I am in the USA, west coast, call if u like 925-577-7157, within the next 2 hours only please, then i am gone out of town

  • yadayada
    yadayada Apr 23, 2010

    here is a web link to a GM factory manual for $69.00



    http://www.faxonautoliterature.com/produ...

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  • Expert
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Hi! Yes it would definitely drop fuel pressure for its not performing well. Hope this helps and have a good one!

Posted on Apr 23, 2010

  • dj_relly999
    dj_relly999 Apr 23, 2010

    If the fuel pump is not responding, like you cant hear a hum when the ignition is turned on. Fuel not getting in the fuel filter is another sign. The baddest sign is when you turn the engine and it does not start.

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Sound like the fuel pumps not doing it job if the fuel pressure drops off quick. Might also be the regulator but most likely the fuel pump is not pumping enough. They only time the fuel pressure should drop off it when you bring the rpm up and it shouldn't drop off that much maybe 5 psi at most any thing below that i would change the fuel pump.

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You connect a fuel pressure gauge like this to the pressure rail. Pressure in this car must be between 35 and 45 psi. If pressure is too low look for kinked fuel lines and eventually replace the pump. If the pressure drops down more than 10 psi in five minutes or if the pressure is considerably higher than that replace the fuel pressure regulator. Below the parts that may need testing:

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1. Fuel tank
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I have a 5.0L 1987 trans am and it is having a very hard time starting. I checked and the fuel pressure is low and as soon as the engine is turned off the fuel pressure imeddiatly drops down to zero. So...


have you checked the fuel filter. this is an easy thing to foget. the pump puts out pressure as soon as it is activated. that pressure has to get thru the filter. if it can not get thru the filter you will have low pressure on the downstream side going to the carb/tb/injectors. check out this image and see what i'm telling you. the regulator only allows so much pressure and the overage goes back to the tank.
good luck and see if the filter is your issue.
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Thank you for using Fixya and good luck

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