1988 Cadillac DeVille 4.5L gas gauge issue

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HT4100 4.1, 4.5, 4.9 Discussion, 1988 Cadillac DeVille 4.5L gas gauge issue in Cadillac Engine Discussion; Well im new here to the site but not to 88 devilles i just bought two today bringing my 88 ...
  1. #1
    fukinclassy88deville is offline Cadillac Owners Member
    Automobile(s): 1988 Cadillac Sedan DeVille
    Join Date
    Oct 2010

    1988 Cadillac DeVille 4.5L gas gauge issue

    Well im new here to the site but not to 88 devilles i just bought two today bringing my 88 deville count up to 3, So here in lies my issue i bought and 88 deville today for $200 as a parts car it has 194k and a clasped #7 lifter, also today picked up another 88 deville with 85k on if for $700 the driver window dosent work was told the motors fine but a clip is broke?? also the gas gauge reads and blinks 'E' all the time even with a full tank, any ideas what is causing this? or a possible fix? I've already switched out the fuel and data center out of the parts car that i know works "bought parts car from my father" that one reads in the parts car but reads and blinks 'E' in the other car as well. Any ideas or help is much appreciated.


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  3. #2
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
    Join Date
    Aug 2007
    Southern Maryland

    Re: 1988 Cadillac DeVille 4.5L gas gauge issue

    There is a float and potentiometer attached to the fuel pump (actually the other way around, there is a pump attached to the fuel sender) and those go bad periodically. They're hard to replace since the tank has to be lowered quite a bit. New ones are kind of expensive but you have a parts donor so at least that is no problem. Here's a pic of the sending unit assembly from rockauto

    Also possible that one of the external wires is bad, but most likely is that the sending assembly always returns zero voltage

    Read the FSM discussion for operational details

  4. #3
    carnut is offline Cadillac Owners Master
    Automobile(s): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003

    Re: 1988 Cadillac DeVille 4.5L gas gauge issue

    Most GM cars will read empty if the sender wire is shorted, pinched, touching metal. will read full if the wire is disconnected. SO, trace the wiring under the car to the tank sender and look for a bare wire or the harness pinched somewhere. And why is this not in the electrical section?

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