Question about 1993 Buick Roadmaster

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I think the fuel pump went out on my 1996 Buick Roadmaster Limited. My parents owned the car before me and had to replace the fuel pump twice. they say it fails if the gas tank is allowed to fall below 1/4. If this is the case, then it would seem to be a suction head-pressure problem causing the pump to undergo some sort of strain. Any insight out there to this? Maybe a fix to prevent future re-occurences?

I thought for sure that the fuel pump is internal to the tank and will require tank removal to replace. however, I read in this forum where the fuel pump for the 1993 model is cited as being under the passenger side rear seat (mine is a 1996).

Plan to replace the pump and the filter. When buyong pump, it typically comes as a package with a new strainer, so that will be new as well. Can you vaqlidate the pump location on the 1996 model?

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  • Don Kultti
    Don Kultti Mar 01, 2009

    Thanks guru. Any ideas on why this will be the third replacement?

  • Don Kultti
    Don Kultti Mar 01, 2009

    Delphi or Airtex...Got it......thanks. Not sure of the intervals between pumps. It seems to be more of a fuel tank level issue. Gonna try to figure it out, but in the meantime will replace the pump, check for any suction or discharge side restrictions and keep the tank above 1/3.

  • Don Kultti
    Don Kultti Jan 29, 2010

    Got the fuel pump out hooked it up to a 12 volt source and it pumps fine. Thinking the problem is with the power going to it. Fuse is good and I replaced the fuel pump relay. Still no power to the pump. Is there any other thing in the wiring that could be causing a disconnect? Bad wire seems possible, but unlikely.

  • Don Kultti
    Don Kultti Feb 06, 2010


    Yes, 10 months and it still isn't fixed. It worked for awhile and then one day stopped again.

    It appears that te problem is interrmittent power being applied to the fuel pump. Took the pump out and connected it to a 12V source and it ran fine. Replaced the rfuel pump relay, no change. There is a jumper factory installed) that permits testing of the pump by connecting a + wire to battery terminal. Did that and it turns fine.

    I am now thinking it may be a faulty oil pressure switch. According to the anual, it cuts power to fuel pump when oil pressure is lost.

    I just gotta find the switch now and when I do I will test/replace it.

    This is one if many cars so there has been no push to get it right. Now, I want to get it done. Going to put the pump back in and see how it goes. If it runs, I will take it to a dealer for an OBD II run and see what it might reveal.

    Going to keep the jomper I made up just in case I need it to get me home.

    I was thinking that there may be something with chipped key that might interface with the fuel ystem but can't find any reference at all to it in the Haynes manual.

    Any other ideas would be appreciated. Hoping I am zeroing in on it now.

    Thanks Brother.


  • Anonymous Mar 26, 2014

    how to drop the tank



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  • Master
  • 4,669 Answers

It is in the gas tank on a 1996 and a 1993

Posted on Mar 01, 2009

  • 1 more comment 
  • Clint Smock
    Clint Smock Mar 01, 2009

    How long between replacements? Also don't buy fuel pumps made by Carter. Use 1)Delphi or 2) Airtex

  • Clint Smock
    Clint Smock Feb 06, 2010

    It took you 10 months to fix this? Have you checked for power and ground at the plug to the tank?

  • Clint Smock
    Clint Smock Mar 27, 2010

    The antitheft system won't shut the fuel pump down, it shuts down the injectors. The oil pressure switch will shut down the pump, it is located by the distributor.



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