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Aftermarket fuel pump install w pics (flex)

Discussion in '2.5 Gen Tundras (2014-2021)' started by fytedapowr, Jun 24, 2021.

  1. Jun 24, 2021 at 12:43 PM
    #1
    fytedapowr

    fytedapowr [OP] New Member

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    Bilstein 6112/5160, CB +2 shackles, SPC UCA's, CB bumper shims, 35's
    After battling with the dealership over flex cold start issues and 81% alcohol density reading. I was able to get them to agree to do the TSB. I'm out of warranty, so they told me the price and I walked right out knowing they would replace the pump assembly with a new pump assembly that contains the same model delphi pump. I decided I would do the pump replacement myself through other means and have them reflash the ECU.

    -Followed @Sumo91 's godsend of a post on the his install (https://www.tundras.com/threads/urd-fuel-pump-kit-install-w-pics.73822/#post-2284985) and ordered URD's pump/filter upgrade with the Deatschwerks 255 LPH pump (https://urdusa.com/urd-2007-tundra-fuel-pumpfilter-upgrade-kit/)


    Once I lowered the tank and found there were three fuel lines running to it instead of 2 like nonflex, this was discovered by almost ripping the last one out of it's place because I didnt' know it existed or why, as there's VERY little information available on the flex fuel pump assembly and it's differences from non flex models. So I reconnected and put the tank back in place to search the interwebs and pirated repair manuals for any information that I could use to make sure I had all the parts needed to not be left up a creek without a truck. Here's a bunch of pics of the info/install I've prettied up and notated for you and hope it supplements @Sumo91 's post and instructions from URD enough to make anyone feel comfortable completing the repair without giving the dealership 1500 for the same damn defective part.

    Happy to answer any questions to the best of my memory. Love and thanks for all the help y'all give 20210425_191414.jpg
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    Last edited: Jun 24, 2021
  2. Jun 24, 2021 at 7:38 PM
    #2
    Sumo91

    Sumo91 Somewhat new member

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    Great job man! Glad my write up could help you out. You added alot of great info! I used the new sock and just bent it up slightly, it's worked so far, and I've damn near run it empty more than once. But the factory sock is the best choice by far as far as fitment. I don't think it matters which one you use since it's just a pre filter for the pump to keep large chunks from killing the pump.
     
    coldcanuk and fytedapowr [OP] like this.
  3. Jun 26, 2021 at 9:24 AM
    #3
    Jeffro22

    Jeffro22 New Member

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    awesome job man. Thanks for detailed pics! I have been trying to find a 38 gallon tank and was planning to do all at same time.

    I have a false alcohol reading also. Mines reads close to 90%. LEt me know how yours does after reflash. Wasn't sure if that was a long term fix or if it was a sensor in the tank that goes bad
     
  4. Jun 28, 2021 at 9:58 AM
    #4
    fytedapowr

    fytedapowr [OP] New Member

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    @Jeffro22
    From what I understand, the ecu calculates alcohol density of fuel when filling up and how fuel responds to inputs (fuel pump on) compared to other sensors in the exhaust and tells your engine to then run like it's fuel is this % alcohol. Of course if it's wrong, engine runs like dogshit. My decision to focus on the fuel pump as causation was based on the latest TSB (now like 2 years old) now requiring a fuel pump replacement along with the ecu flash and density learning reset.

    Can't say with certainty if it will work for everyone, but I haven't seen anyone on here or tundrasolutions that has done all 3 things from the TSB and still had an issue.
    I had the ecu reflash prior, but the dealership was very difficult to work with. And I know they didn't relearn alcohol density, so part of me doubts if they even reflashed as they claim. I'll need to ask autozone for their OBD scanner to check what ECU version is installed (vehicle specific version listed in TSB) to verify if it was completed.

    I will say immediately after the install, my reading dropped from 85% (where it has been forever) down to 72%, then 53% a few days later and haven't checked since, assuming it continued to correct downwards.

    I'll check those this week and let you know, but I'd absolutely do the pumpswap anyways. It's not nearly as difficult as it seems. And if you're upgrading to 38, thought about the larger (46gal) transferflow tank? Wish I had the foresight to have that or 38gal upgrade tank on hand
     
  5. Jun 30, 2021 at 5:19 PM
    #5
    m_w92278

    m_w92278 New Member

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    Great write up!!! Just did mine today easy half day job with these instructions.
     
    fytedapowr [OP] likes this.
  6. Jun 30, 2021 at 5:29 PM
    #6
    Black Wolf

    Black Wolf INCOGNITO undercover mafia

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    This should be a sticky I'm thinking.....
     
  7. Jul 1, 2021 at 7:14 AM
    #7
    Jeffro22

    Jeffro22 New Member

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    Would like to know how you alcohol density is over the next month or 2. Hopefully this fixed the issue
     
  8. Aug 14, 2021 at 5:39 PM
    #8
    68vert

    68vert New Member

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    @fytedapowr Thanks for putting this together. I referenced it this weekend. After replacing the stock Delphi with the DW200, it feels like a brand new truck.
     
  9. Aug 15, 2021 at 6:34 AM
    #9
    Jeffro22

    Jeffro22 New Member

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    Op- any update on alcohol density?
     
  10. Aug 24, 2021 at 7:04 AM
    #10
    fytedapowr

    fytedapowr [OP] New Member

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    @68vert glad I could help a few folks out there! Have you scanned your alc density since?

    @Jeffro22 I checked with autozones scanner to see if they were able to read my ECU version and they were not, so I dont know still if it's actually been reflashed. And haven't been monitoring alc density often (since it's been driving vastly better) but this morning it was showing 48.5%, so still quite wrong. It's dropped a lot initially, then slowed its curve to tenths of a percent decrease. But its consistent, never reading higher. So there's that
     
  11. Aug 24, 2021 at 5:04 PM
    #11
    68vert

    68vert New Member

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    I dont think my scanner has the ability to check the alcohol density :confused:
     
  12. Sep 23, 2021 at 8:53 AM
    #12
    fytedapowr

    fytedapowr [OP] New Member

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    Following up;
    Today was the first cold (50s) morning since new pump. Since most people anecdotally had issues on particularly cold mornings, I wanted to check to see of the alc density would spike.

    Great news, no rough start, no weird idling, and alcohol density is closer than ever to accurate

    Screenshot_20210923-084531_BlueDriver.jpg
     
  13. Jan 10, 2022 at 2:29 PM
    #13
    Deaner619

    Deaner619 New Member

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    The website says these pumps aren't flex fuel compatible is thay true?
     
  14. Jan 11, 2022 at 8:22 AM
    #14
    fytedapowr

    fytedapowr [OP] New Member

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    Some are, some are not. The one I mentioned for sure is.

    Follow up: Alc density at 8.9% now. Ecu still not updated yet, but planning on it as I still have 1st gear engagement issues in the cold. All else is great
     
  15. Jan 14, 2022 at 7:43 PM
    #15
    jason......

    jason...... New Member

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    Just had the ECU update 30CK0700 (for a 2012) and the trim and ethanol reset. Filled with E10, ethanol % showed 6% for about 2 minutes, then dropped to 0. I think the latest ECU update looks for a threshold, probably 15% or so, and if it's less than that, forces it to 0. My ethanol was over 60% and major cold start issues prior to the ECU update and resets.

    Was told I needed the fuel pump, with a $3500 price tag here in Canada. Just did the ECU update and reset trim and ethanol ($200), and so far so good.

    I am using a Veepeak OBDCheck BLE+ Bluetooth 4.0 ($50) with iphone, and the Car Scanner ELM OBD pro app ($10). This tells you the ECU update version, and allows you to monitor everything. Best money I ever spent. Even works to turn off the seatbelt nanny chime.
     
    Last edited: Jan 14, 2022 at 7:59 PM

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