03 DTS fuel gauge reading funny
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 03 DTS fuel gauge reading funny in Past Cadillac Vehicle Discussion; When I got to work I had slightly under 1/8 tank gas. When I left to go home I looked ...
  1. #1
    DSNCB919 is online now Cadillac Owners Fanatic
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    03 DTS fuel gauge reading funny

    When I got to work I had slightly under 1/8 tank gas. When I left to go home I looked down when leaving parking lot and it claimed I had 7/8 then 2 miles later 1/2 and sat there for a while.. I saw in an older post to add fuel additive does this really work?

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 03 DTS fuel gauge reading funny

    No. You are going to need a new sending unit. The good news is that you have an access panel in the trunk so there is no need to drop the tank.

  4. #3
    DSNCB919 is online now Cadillac Owners Fanatic
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    Re: 03 DTS fuel gauge reading funny

    Is it plug and play? this seems like a easy diy

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 03 DTS fuel gauge reading funny

    It's essentially a straight swap. SOME of the newer pump modules include a heavier electrical connector and pigtail that must be spliced and crimped onto the existing body wiring. Older models had a square 4-pin connector that, it was thought, might create a high resistance connection, so the larger blade flat connector came into service. That's an extra half hour of wiring play.

    You might have a bit of grief trying to loosen the lock ring - use a brass drift and a hammer - no sparks wanted here ......... Or, rent a lock ring tool at a large parts store.

    Look in my albums - there are pictures of a pump module. The Community tab, Albums, the red Seville.

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    DSNCB919 is online now Cadillac Owners Fanatic
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    Thanks

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    Re: 03 DTS fuel gauge reading funny

    I have '03 DeVille and recently had this problem. I bought EOM sending unit. Like Ranger says, there is an access panel in the trunk, which makes the job pretty dang easy. The ONLY tricky part is that lock ring, that can be a real PITA, but you just gotta work it slowly off, and then back on when done. Of course, you also gotta be EXTRA careful of the immense fire hazard, especially once you start working around that lock ring. I made sure to do mine outside, in the fresh air, so that fumes would not build up....

    Good luck!

  8. #7
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Use a brass drift to remove the ring (if you don't have the removal tool), no sparks.

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    DSNCB919 is online now Cadillac Owners Fanatic
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    Re: 03 DTS fuel gauge reading funny

    Do you have any pics? It also hasn't done it since and only happened that once but I still might as well replace

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 03 DTS fuel gauge reading funny

    If you go to the RockAuto parts site and get into fuel pumps for your car, in one of the brands listed there is a YouTube of the replacement process.

    Click on the little INFO tab for each pump module - a larger picture pops up. Some of the module (brands) have additional pictures, accessed by the < and > arrows on the picture. One or two pump brands has the YouTube video embedded there. There's also a picture sequence down in Tech Tips. Either surf through the many pages of threads or Google something like "cadillac forums seville devlle fuel pump replacement".

    Here's a long shot that works occasionally - Chevron TECHRON is a powerful fuel system cleaner (a component of Top Tier gasoline) that also attacks sulfur deposits on the fuel level sender variable resistor strip - the deposits interfere with the wiper fingers electrical contact. Use a 20 oz. bottle of TECHRON with a fill-up of a Top Tier gasoline - you might get lucky. Don't dose Top Tier gas with extra TECHRON any more than once in 5,000 miles.

  11. #10
    DSNCB919 is online now Cadillac Owners Fanatic
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    A youtube video is ALL I need thanks

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    DSNCB919 is online now Cadillac Owners Fanatic
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    Re: 03 DTS fuel gauge reading funny

    $%#@!!! I am going to have to remove my entire built in sub and amp system to access this panel

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