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Mighty Demon 850 Needle/seat issues

Discussion in 'Holley' started by DasRottweiler, May 29, 2020.

  1. DasRottweiler

    DasRottweiler -BuickAddict-

    Secondary bowl keeps flooding. Started at hard stops , then turns , then as soon as electric fuel pump kicked in at startup. Fuel blowing right thru needle/seat. Has been an issue before, time to order new needle/seats.
    I ordered 110 viton needle /seats with springs for heavy duty and marine applications.
    The needle/seat I removed was a self contained unit, that is, you can pull it out, drop it back in. However, the new ones came in pieces, as seen in pic.
    What the hell am I supposed to do, pull the carb , flip it upside down to install these?
    2020-05-29 18.40.24.jpg
    Jim
     
    DasRottweiler, May 29, 2020
    #1
  2. Bens99gtp

    Bens99gtp Well-Known Member

    Pull the bowels,you might be able to use some vaseline to stick it all together and the gas will dissolve it away
     
    Bens99gtp, May 29, 2020
    #2
    DasRottweiler likes this.
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Pull the bowls and invert them.
     
    LARRY70GS, May 29, 2020
    #3
    DasRottweiler likes this.
  4. DasRottweiler

    DasRottweiler -BuickAddict-

    That thought came to mind after typing "pull the carb, flip it upside down".
    I bought a palm ratchet for removing secondary float bowl screws when rejetting carb, guess I'll put it to use tomorrow morning . Thanks for the replies gents! As long as I didn't get a "toss em , they're garbage." I'll move forward....Jim
     
    DasRottweiler, May 29, 2020
    #4
  5. telriv

    telriv Founders Club Member

    See that o-ring on the old needle & set??? MANY times it's that o-ring. Try changing it BEFORE replacing. IF you have any old Holley or Demon rebuild kits usually there are extra o-rings in the kit that VERY OFTEN don't get used.

    Tom T.
     
    telriv, May 29, 2020
    #5
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  6. DasRottweiler

    DasRottweiler -BuickAddict-

    I do have a used rebuild kit, I'll check for o-rings. Ty for the tip......Jim
     
    DasRottweiler, May 29, 2020
    #6
  7. DasRottweiler

    DasRottweiler -BuickAddict-

    Pulled the o-ring off the original needle/seat. It was brittle and snapped while being removed. The culprit , no doubt. I got my o-ring assortment out and matched it up, installed needle/seat assembly , reset float level and bumped the electric fuel pump , and wella , she holds!
    Thanks for your replies gents, and Tom T, thank you for the tip, proved most helpful!
    JIM
     
    DasRottweiler, May 30, 2020
    #7
  8. telriv

    telriv Founders Club Member

    Glad I was able to help Jim.
    Hopefully you didn't use any old o-ring from an assortment. It NEEDS to be fuel compliant that's why I mentioned a rebuild kit as the o-rings in them are fuel tolerant.

    Tom T.
     
    telriv, May 30, 2020
    #8
  9. DasRottweiler

    DasRottweiler -BuickAddict-

    I did find a couple in the rebuild kit I have. That fuel compliance thing crossed my mind....Thanks again.
     
    DasRottweiler, May 30, 2020
    #9

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