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FlexFuel Fuel Pump Issue?

Discussion in '2.5 Gen Tundras (2014-2021)' started by Scorpion006, May 4, 2023.

  1. May 10, 2023 at 5:01 PM
    #31
    BrandonL812

    BrandonL812 New Member

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    Dang. that stinks. Well. Get a copy of techstream and see if you can reset the alcohol density. Go from there.
     
  2. May 10, 2023 at 5:05 PM
    #32
    BrandonL812

    BrandonL812 New Member

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    well, I don’t know. Because there are others who have had the fuel pump replaced under warranty and STILL have the problem. Would that mean the fuel pump is bad again?
     
  3. May 10, 2023 at 5:12 PM
    #33
    BTBAKER

    BTBAKER DIFFERENT NAME. SAME JUNK.

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    No. It’s means that Toyota has no fix to keep the alcohol density percentage correct and they don’t plan to find one. As long as you own a flex fuel Tundra you’ll have the problem. The pump does nothing.
     
    itshelly and BrandonL812[QUOTED] like this.
  4. May 10, 2023 at 5:41 PM
    #34
    dt325ic

    dt325ic Member

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    I feel the best approach is to keep an eye on the fuel alcohol percentage via obd reader. When it starts creeping up, reset the percentage via dealer, techstream, or one of the bi-directional scanner/readers that have the capability.
     
    BrandonL812 and BTBAKER[QUOTED] like this.
  5. May 10, 2023 at 5:51 PM
    #35
    BTBAKER

    BTBAKER DIFFERENT NAME. SAME JUNK.

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    You are correct. I didn’t have the capability, unfortunately. The fuel pump did nothing for me.
     
  6. May 10, 2023 at 6:58 PM
    #36
    BrandonL812

    BrandonL812 New Member

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    I will have to keep an eye on our sequoia then. It too have the flex-fuel engine. At 32k, so far nothing yet. Hopefully it wont show up. But can never be too sure. I do have the knockoff techstream that I’ve used to change couple setting like seatbelt chime volume and key reminder chime volume. So I’m some-what familiar with how it works.
     
  7. May 17, 2023 at 12:41 PM
    #37
    coopsdaddy23

    coopsdaddy23 New Member

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    Na
    Are all the 2017s flex fuel?
     
  8. May 17, 2023 at 1:28 PM
    #38
    CTundraForMe

    CTundraForMe New Member

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    I believe manufacturers were mandated to create a certain percentage of them. Not all of them, thank God!
     
  9. May 17, 2023 at 4:24 PM
    #39
    endagon

    endagon New Member

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    Not so much mandated as every flex fuel vehicle was assumed on paper to run gas half the time, so it boosted the brand's fleet mpg to meet the federal standard. I wonder if that bonus may have ended as a lot of flex vehicles have gone away

    Imagine every ffv 5.7 counted as a 28 mpg vehicle
     
  10. May 17, 2023 at 4:36 PM
    #40
    Scorpion006

    Scorpion006 [OP] I'm athletic - I’m known to surf the web for hours

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    Definitely not...
     
  11. May 18, 2023 at 8:23 AM
    #41
    coopsdaddy23

    coopsdaddy23 New Member

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    If you were in the market for a 2017-2020 would you pass on the flex fuel Versions,or is it a something that’s affecting just a few.
     
  12. May 18, 2023 at 8:34 AM
    #42
    dt325ic

    dt325ic Member

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    I would buy based on condition and price. If it happens to be non flex-fuel, then you got lucky.

    The issue can be contained by resetting the fuel alcohol percentage, so long as you do this before the fuel pump burns out.
     
  13. May 18, 2023 at 8:35 AM
    #43
    Scorpion006

    Scorpion006 [OP] I'm athletic - I’m known to surf the web for hours

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    I bought one not knowing that it was a Flex Fuel version.... I see it as a benefit - that I can basically run any E85 if I wanted or I can just run regular gas. (Almost Hybrid like:rofl:)

    Other than this possible Fuel Pump issue - nothing to complain about...
     
  14. May 18, 2023 at 9:49 AM
    #44
    endagon

    endagon New Member

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    E85 cleans carbon buildup like crazy and makes more torque so it's not all bad. Some ffv trucks never have a problem
     
  15. Jun 1, 2023 at 7:52 AM
    #45
    c_western

    c_western New Member

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    Same issue over here. 2018 FFV that had a hard time starting if it was 40* or below. Luckily its still under the federal emissions warranty, but it's been at the dealership waiting on a fuel pump since February 15th and they still have no idea ETA for when they'll receive fuel pumps.
     
  16. Jun 1, 2023 at 8:25 AM
    #46
    NewImprovedRon

    NewImprovedRon New Old Guy

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    I don't know that it affects all flex fuel engines. I have a 2015 and have never had the issue with mine.
     
  17. Jun 2, 2023 at 10:26 PM
    #47
    alanc3

    alanc3 New Member

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    I finally got my issue fixed! Cost about $1,100 and about 6 months of waiting but they replaced the fuel pump and recalibrated the fuel-alcohol ratio and she runs perfect again!
     
  18. Jun 14, 2023 at 10:59 AM
    #48
    MyActualName

    MyActualName New Member

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    My 17 flex fuel truck starts fine even in cold weather, but has intermittent lurches/pulsing vibrations in 5th and 6th gear at highway speeds only when the weather is below 40-50 degrees. My initial assumption is torque converter since it goes away if I shift to 4th.

    Has anyone else with a bad fuel pump experienced this?

    My alcohol percentage is a pretty constant 2.75%, even when filled up with non-ethanol fuel which is a little strange.

    I won't be able to test it for another 6-7 months when it gets cold.
     

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