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HELP: Fuel gauge shows half tank when tank is full

Discussion in 'General Tundra Discussion' started by Deucemimo, Jan 19, 2019.

  1. Jan 19, 2019 at 6:33 PM
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    Deucemimo

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    Deucemimo [OP] New Member

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    I recently filled up my tank, the gauge shows half tank but my tank is full. I was only able to get 13 gallons into the tank. I pulled the neg battery cable to reset but that didn't help.


    Does anyone have any other suggestions on how to calibrate the fuel gauge?
     
    Deucemimo, Jan 19, 2019
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  2. Jan 19, 2019 at 7:13 PM
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    T-Rex266

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    T-Rex266 Elon approved Staff Member

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    Do you normally top off your fuel?
     
    T-Rex266, Jan 19, 2019
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  3. Jan 19, 2019 at 7:14 PM
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    Black Wolf

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    I know where this is going. For good reason...
     
    Black Wolf, Jan 19, 2019
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  4. Jan 19, 2019 at 7:36 PM
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    Deucemimo

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    Deucemimo [OP] New Member

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    Yes....... Sometimes
     
    Deucemimo, Jan 19, 2019
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  5. Jan 19, 2019 at 7:37 PM
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    Black Wolf

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    Never ever top off fuel on your Tundra......
     
    Black Wolf, Jan 19, 2019
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  6. Jan 19, 2019 at 7:40 PM
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    Deucemimo

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    Deucemimo [OP] New Member

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    Interesting.......How does topping off fuel play role in this situation?
     
    Deucemimo, Jan 19, 2019
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  7. Jan 19, 2019 at 7:41 PM
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    Black Wolf

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    Black Wolf, Jan 19, 2019
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  8. Jan 19, 2019 at 7:42 PM
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    Black Wolf

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    Black Wolf, Jan 19, 2019
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  9. Jan 19, 2019 at 7:42 PM
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    Black Wolf

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    Black Wolf Bigfoot Hunter, Sasquatch too, but not Yeti

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    Black Wolf, Jan 19, 2019
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  10. Jan 19, 2019 at 7:47 PM
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    Black Wolf

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    You may have messed up your Evap system. Others should chime in. A few here have had that same issue of over filling and causing a lot of problems related to what you are experiencing.
     
    Black Wolf, Jan 19, 2019
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  11. Jan 19, 2019 at 7:47 PM
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    Deucemimo

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    Deucemimo [OP] New Member

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    Thanks for the info
     
    Deucemimo, Jan 19, 2019
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  12. Jan 19, 2019 at 7:54 PM
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    Black Wolf

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    Black Wolf Bigfoot Hunter, Sasquatch too, but not Yeti

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    @T-Rex266 was right to ask if you normally top of when fueling. Caught my my eye so I chimed in. A failed evap system can cause weirdness, on the other hand the best thing to do in your case is go to the dealer and verify. I know....sucks.
     
    Black Wolf, Jan 19, 2019
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  13. Jan 19, 2019 at 7:58 PM
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    Deucemimo

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    Deucemimo [OP] New Member

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    Much appreciated........I figured I would get a check engine light in a situation like this.

    I'll have dealer check it out next week.
     
    Deucemimo, Jan 19, 2019
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  14. Jan 19, 2019 at 8:07 PM
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    Black Wolf

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    Black Wolf Bigfoot Hunter, Sasquatch too, but not Yeti

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    I agree..you would think you'd get a CEL but then again it really comes down to what could potentially trigger a CEL from the Evap system other than a loose fuel cap and that is above my pay grade.....
     
    Black Wolf, Jan 19, 2019
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  15. Jan 19, 2019 at 10:10 PM
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    T-Rex266

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    T-Rex266 Elon approved Staff Member

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    Have you tried a different pump / station?
     
    T-Rex266, Jan 19, 2019
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  16. Jan 20, 2019 at 3:24 AM
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    timsp8

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    timsp8 Former Tundra owner for 13 years

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    Could it be the fuel sending unit? There was a post here a few weeks ago by someone whose unit went bad. I had a 46 gallon tank in my 2010 and could get another 3-4 gallons in it after the pump shut off. Did this topping off for years and never had an issue.
     
    timsp8, Jan 20, 2019
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  17. Jan 20, 2019 at 3:54 AM
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    Black Wolf

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    Black Wolf Bigfoot Hunter, Sasquatch too, but not Yeti

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    I recall seeing that post. Sending units can fail. Not a cheap fix.The topping off is only bad if you overfill enough for gas to get into the Evap lines and foul the canistor. That Evap canister is a bit pricey too.
     
    Black Wolf, Jan 20, 2019
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  18. Jan 20, 2019 at 3:54 AM
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    Deucemimo

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    Deucemimo [OP] New Member

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    Yes, I tried this.
     
    Deucemimo, Jan 20, 2019
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  19. Jan 20, 2019 at 4:25 AM
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    Navi

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    Navi New Member

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    +1 fuel sending unit.

    this happened to me on my 2001 tundra, and it was about $450 to have it repaired but it did fix the problem. the part is cheap but it’s hard to get to, which is why it’s expensive

    but my truck was a 2001 and the OP has a 2014 so maybe not the problem but worth considering.
     
    Navi, Jan 20, 2019
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  20. Jan 26, 2019 at 8:20 AM
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    Deucemimo

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    Deucemimo [OP] New Member

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    Update.........Fuel pump assembly floater broke off into tank. Dealer repaired under warranty
     
    Deucemimo, Jan 26, 2019
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    T-Rex266 and 831Tun like this.
  21. Jan 26, 2019 at 8:24 AM
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    Navi

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    Makes sense. Glad it was covered
     
    Navi, Jan 26, 2019
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