1997 Eldorado gas gauge problems
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 1997 Eldorado gas gauge problems in Past Cadillac Vehicle Discussion; The gas gauge on our 97' Eldorado is not working properly. The gauge reads full most of the time so ...
  1. #1
    Bjpeneldo is offline Cadillac Owners Member
    Automobile(s): Eldorado
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    1997 Eldorado gas gauge problems

    The gas gauge on our 97' Eldorado is not working properly. The gauge reads full most of the time so we never know whats in the tank, so we have to keep track using the trip gauge and do the math. The digital display seams to be in line with the gauge because the trip meter jumps around following the gauge. I read something that said to clean the contacts on the top of the gas tank. Not sure if I have to pull the tank or if this is even the right fix for the problem. This is the first Cadillac that we have had as it was inherited. The car is in great shape and I would like to keep it that way , I have worked on all my vehicles through the years and want to make sure I am doing the right thing.

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  3. #2
    Mafiaman111 is offline Cadillac Owners Fanatic
    Automobile(s): 1998 Cadillac Eldorado 173000 miles Black on Black
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    Re: 1997 Eldorado gas gauge problems

    there is a problem with the gas float which is in the tank and the tank has to be dropped to gain access to it and will probably need replaced

  4. #3
    N*Caddy's Avatar
    N*Caddy is offline Cadillac Owners Master
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    Re: 1997 Eldorado gas gauge problems

    You can try to clean the contacts you can try (it will be recommended) to pour some solution X in the fuel tank.
    But most likely the issue is the fuel sender unit. You have a wire coiled on a semicircular support. Over the coils there is a contact (at the end of an arm connected to a float) sliding back and forth. The whole assembly is basically a variable resistor.
    In time the contact go bad (loose, broken or dirty).
    You most likely need to replace the fuel sender unit. You can find just the sender unit or the full fuel pump/sender unit.
    Since in your vehicle is a tank drop job (not easy) I wold recommend to replace the whole assembly, if the sender unit fails what you expect the fuel pump will do next.

    Also is recommended to avoid driving on near empty tank, the gas actually acts as coolant for the fuel pump (it makes no difference on the wallet of the tank if full or empy, after all you still have to pay for the fuel you use).

  5. #4
    Bjpeneldo is offline Cadillac Owners Member
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    Re: 1997 Eldorado gas gauge problems

    Thanks for the info, were would I find solution x ? Are the contacts on the top of the tank accessible or do I have to drop the tank to get to them ?

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    "Solution X" would be a 20 oz. bottle of Chevron Techron.

    The contacts are on the level sender assembly inside the tank.

    As posted, you'll probably just need to replace the level sending unit.

    BTW,

  7. #6
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 1997 Eldorado gas gauge problems

    For the reasons behind several members recommending "Solution X" (Chevron TECHRON), Google it. TECHRON is a powerful fuel system cleaner (it's a component of Top Tier gasolines - Google it) and one of its claimed "cleanings" is to attack sulfur deposits on the fuel level sender resistance bar. If it solves your level sender problem, well and good; otherwise you'll have spent about $12.99 for clean fuel injector tips.

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