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348 Fuel pump R&R and some supply chain woes

Discussion in '348/355' started by steved033, Jan 3, 2021.

  1. steved033

    steved033 F1 Rookie
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    Apr 12, 2017
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    Steve D.
    I hear they swelled, but less than the existing. If he was measuring diameter, it was about 7%. I haven't heard since.

    sjd
     
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  3. Ricambi America

    Ricambi America F1 World Champ
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    It is still in the tank of fuel. I have been measuring it every 3 days.
     
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  4. Ferrarium

    Ferrarium F1 Rookie
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    I suspect the allowable amount of swelling is near 0?
     
  5. steved033

    steved033 F1 Rookie
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    A 100% viton part will swell nearly zero, and will retain its structure.

    sjd
     
  6. steved033

    steved033 F1 Rookie
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  8. steved033

    steved033 F1 Rookie
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    Apr 12, 2017
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    I didn't disconnect the pump from the hoses, so it made it super fiddly, but the pumps went right together. the bottom ring was a little tighter on the OD as the viton pad between the plastic and the pump pushed it open at the bottom:

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    here's a view with both rings on:

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    the bottom screen going on. The second one I put the top on first then the bottom, and it went a little easier. Some lube might have helped too, the sharp edge on the viton hung up going into the cup on both parts.

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    Final fit together, and the return re-molded and spaced properly. I ziptied the two lines to keep the return loop from waving around.

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    I ran out of time to fuel it and fire it up, as I changed out FPRs, too.

    sjd
     
  9. QSA

    QSA Formula Junior
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    #57 QSA, Feb 10, 2021
    Last edited: Feb 10, 2021
  10. steved033

    steved033 F1 Rookie
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    It's a standard grade of FKM. Feels like Durometer 75. Seems pretty close to the mcmaster test pieces I made myself.

    I have a test piece of it in a jar of fuel with a sample of nylon from the clamp. There's been no swell and no change so far, per your document, it'll take 168 hours...I can't simulate the 40C. I'll check it from time to time and refresh the fuel occassionally. I'll post if there are any issues, this is an engineering experiment.

    Viton Type F seems to be the best for fully submerged parts. Type F is by far the best, and from my reading the hardest durometer and most durable. Did I request anything specific? no. It's a good solution, there are a couple things that I'd make changes to, and I have a supplier that's willing to make a few sets with type F.

    As a note, the grey electrical covers are swollen, but haven't shown any cracks or tears, and it's been two months.

    sjd
     
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  11. steved033

    steved033 F1 Rookie
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    Runs.
    Drives.
    There's no different noise from the pumps. (I was worried that there would be less damping with the new setup and more pump noise....but nope)

    sjd
     
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  13. Carmellini

    Carmellini Formula Junior
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    ^^^congrats....nice work
     
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  14. Targatime

    Targatime Karting
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    Feb 22, 2014
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    Los Angeles
    Congrats. Now, are you gonna sell a kit? Pretty-please?
     
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  15. steved033

    steved033 F1 Rookie
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    We can talk. :)

    I need to make a couple small tweaks to the model, and it's good to go. I have to do some analysis (basically looking at all the cars that use or could be converted), so that it's not absurdly expensive, I also don't want to be sitting on parts for the next 30 years.

    If you're interested, PM me, we can talk.

    sjd
     
  16. Ferraripilot

    Ferraripilot F1 World Champ
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    May 10, 2006
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    I like that it is a pretty simply and effective solution. No need to get overly complicated. Great stuff Steve
     
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  17. steved033

    steved033 F1 Rookie
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    Timeline/update:

    2021:
    1/15: test parts went in fuel
    2/10: parts went in tank. fresh FPRs. I was so out of gas, I had to go get a 5 gallon can filled. I also had to do an ECU reset with the new FPRs in there.
    2/12: fuel in test jar refreshed. still no change in nylon or viton parts.
    2/15: added 7 gallons of Shell 93 (same as test jar)
    3/1. +100 miles on the car. no hiccups. I think it runs better than it had.

    More to come.

    If you're interested in this solution, PM me, The big hurdle is having the viton cut. I need to do more than 1's and 2's.

    sjd
     
  18. Targatime

    Targatime Karting
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    Feb 22, 2014
    185
    Los Angeles
    Please mark me down for a 355 kit.
     
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