Gas gauge issue
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Gas gauge issue in Past Cadillac Vehicle Discussion; Hi, I am having an issue with the gas guage in my 93 Deville (flashing E). I have read some ...
  1. #1
    r_2016's Avatar
    r_2016 is offline Cadillac Owners Fanatic
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    Gas gauge issue

    Hi,


    I am having an issue with the gas guage in my 93 Deville (flashing E). I have read some things about the gas tank ground possibly being bad; does anyone know where it is located? Also, if the ground were bad, wouldn't the fuel sender not work? Is it a separate connector for the float switch? Another thing, I have only put about 5 gallons in it and judging by the footprint of the tank, there would only be about 1 inch of fuel in it. I am wondering if that's enough for the float switch to register anything. The car has been disconnected and the ECU has no previous data to go by. The reason why I haven't taken it to the gas station yet is because I don't have registration for it yet, so it can't leave private property.

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    IIRC, the gauge flashes E with less than 2 gallons remaining. The level sender is probably bad.

    Have you pulled your codes?

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    r_2016's Avatar
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    Re: Gas guage issue

    I haven't pulled any coed yet, but I will check them. The fuel sending unit is new. Thanks

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    r_2016's Avatar
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    Re: Gas guage issue

    Ok, I put a full tank of gas in the car and it is still reading "E", so my next step is to take a reading off the float switch. Does anyone know what the resistance should be at E and at F? The fuel sending unit is new; can I replace the float switch by itself if need be? I have seen some other people on here saying they have had issues with the fuel gauge when the sending unit was replaced. I am wondering if maybe the aftermarket fuel sending units don't agree with this car and the Delco units should be used.

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    reppinshadyvill is offline Cadillac Owners Fanatic
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    Pull it out and take a look. Float/strainer may be stuck on something.

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    r_2016's Avatar
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    Re: Gas guage issue

    I will take a look at that. I asked a friend of mine and he seems to think that the fuel pump is independently grounded, so it is also possible that it could be a bad tank ground also.He said too that the float switch could be stuck, even though it is a new unit. I will keep everyone posted when I crack her open. Thanks guys

  8. #7
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Gas gauge issue

    It sounds like a problem with the wire or a defective sending unit. When they lose power they stay on empty, when they lose ground they stay on full. You can test the sending unit while it is out of the tank by hooking up the wire and grounding the unit and moving the level arm. I live dangerously and never do it when I get a new one but I would be bummed if I had to drop that tank again.

  9. #8
    still_walkin's Avatar
    still_walkin is offline Cadillac Owners Connoisseur
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    Co sign fuek sending unit mine used to that every time I turn the key it would guess a different number of gallons I had

  10. #9
    Aztec ETC ECS's Avatar
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    Re: Gas gauge issue

    Full is high resistance & empty is low resistance. There could be a short to ground.

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