Faulty fuel tank sending unit issue.

Discussion in 'Trailering' started by MonacoMike, Apr 28, 2011.

  1. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    My 05 Chevy Suburban is giving erratic fuel gauge readings. I fill up with key out and at restart the fuel gauge reads slightly below the full mark. It may show this way for several miles or stops if around town and then it will show over full, (just as it did when new) the function is normal after 7/8 tank. I suspect ethanol corrosion. Anyone have a similar issue? MM
     
  2. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    Would the Starbrite ethanol treatment help?
     
  3. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Mike, not sure about the starbrite brand but i have fixed over 40 Fords (without exaggeration) with your exact same concern with chevron techron fuel system additive. http://www.chevron.com/products/prodserv/additives/tcp.aspx
    The problem stems from excessive sulfur build up on the fuel sender resistance card. You may have to add it for a tank or two and then every once in a while after that. Ford finally came out with a service bulletin/recall to replace the sender unit because of customer complaints.
     
  4. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    Thanks for the suggestion. I'll get some in and report back. MM
     
  5. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Mike, just wondering if you ever resolved this issue?
     
  6. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    Mixed, I used 4 bottles of the 20 gallon mix in 2 full tanks. It still must have the gas full for a while before registering full on the gauge. At $20+ per tank I just quit. MM
     
  7. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    An old thread revived with new information. The gauge situation never changed from the original post, that is until a couple of months ago. I decided to try the 91 octane ethanol free for a while to see how she would run. WOW!!! Like a horsepower boost. Runs so smooth, yet you can hear the power difference from 87 octane E-10. I tried the 93 E-10 but it did not have near the affect.

    After about 3-4 tank fulls, the gas gauge works perfect. It did not work properly for 7 years! Go figure. The cost difference is less than the additive I tried. The performance difference is awesome.

    MM
     
    Jaybeaux likes this.
  8. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    I was hoping you would comment on my results.

    MM
     
  9. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Interesting. 1.) Do you have the 91 and 93 reversed in this post? If not, the 93 non E fuel would make even more of a difference.

    I'm not at all surprised of your "horsepower boost" recognition as some of us are more conscious and dialed into our vehicles performance especially after logging many hours/miles on the same vehicle. When you switch to a higher grade fuel, (even for engine calibrations that do not require it) the P.C.M. recognizes it and will let the timing advance further than usual because it doesn't sense knock under certain calculated load situations which it derives from input information from various sensors i.e. maf, tps, cmp, ckp, iss, oss, along with others depending year make and model.

    2.) Do you normally run the tank down to, or close to empty before fill up as this will help the sender unit in any fuel tank, truck, car, boat or anything else for that matter last longer because the resistance card will not wear out in certain areas sooner than if the contacts were being used in a wider range. (think about the float bobbing up and down all the time in a small range in a moving tank.)

    As far as the suggested additive goes, since the gauge was not working correctly for so long I would have to imagine the resistance card possibly had quite a bit of build up on it but I guess time will tell. I don't think you need to add it every fill up but once in a while should suffice.
     
  10. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    Interesting. 1.) Do you have the 91 and 93 reversed in this post? If not, the 93 non E fuel would make even more of a difference.

    No, I am running 91 E-Free, I was just commenting that trying 93 E-10 made no noticeable difference.

    I'm not at all surprised of your "horsepower boost" recognition as some of us are more conscious and dialed into our vehicles performance especially after logging many hours/miles on the same vehicle. When you switch to a higher grade fuel, (even for engine calibrations that do not require it) the P.C.M. recognizes it and will let the timing advance further than usual because it doesn't sense knock under certain calculated load situations which it derives from input information from various sensors i.e. maf, tps, cmp, ckp, iss, oss, along with others depending year make and model.

    Makes sense.

    2.) Do you normally run the tank down to, or close to empty before fill up as this will help the sender unit in any fuel tank, truck, car, boat or anything else for that matter last longer because the resistance card will not wear out in certain areas sooner than if the contacts were being used in a wider range. (think about the float bobbing up and down all the time in a small range in a moving tank.)

    Yes, much to the wife's consternation, I usually run it down to empty.

    As far as the suggested additive goes, since the gauge was not working correctly for so long I would have to imagine the resistance card possibly had quite a bit of build up on it but I guess time will tell. I don't think you need to add it every fill up but once in a while should suffice.

    The additive did work in a temporary way, to maintain the constant function would have required nearly constant additive use.



    Thanks for the input. See above in red.

    MM
     
  11. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    If you can post or pm me a vin I can check to see if there are any GM associated TSB's (they are vin specific) like the one I mentioned earlier for which, when that treatment didn't resolve the customers concern, a new, updated sender unit was installed and maybe there is a similar one available for your truck.
     
  12. MonacoMike

    MonacoMike Well-Known Member

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    2000 Cruisers 3870
    97 270 Sundancer
    85 Sea Ray Monaco 197
    8.2 Mercs,
    7.4 BII
    260hp Alpha 1
    Will pm ASAP.

    MM
     

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