Discussion in 'Other' started by Rossco, Jan 26, 2020.

  1. Rossco

    Rossco Greetings Earth Creatures

    I'm no carb expert, in fact this is the first time I've used a carb in over 40 years.

    I've got an AED 850HO bolted on to my fresh built 455. Worked fine during cam break in but on coming back to it today the front float doesnt appear to be working and fuel is coming out of the part circled in red below.

    Apologies for my lack of knowledge as to what this parts is called.

    Last edited: Jan 26, 2020
  2. johnriv67

    johnriv67 Well-Known Member

    That part is the rear vent tube. Do you mean the front one? That means the float level is set too high
    Rossco likes this.
  3. Bens99gtp

    Bens99gtp Well-Known Member

    Or there could be something stuck in the needle an seat, dirt, small piece of teflon tape. Best to remove the bowl, remove the needle and seat an verify and reset.

    Dont just assume it's only a float level adjustment

    Your carb appears to sight glass windows.....set float level about 25% of the way up the window.

    To remove the needle and seat just loosen the hex nut and turn it adjustment level wont be effected....
    To adjust you need to hold the hex nut and loosen the jam screw with a thick bladed flat screw drive....then turn the hex nut..

    Attached Files:

    Rossco likes this.
  4. Rossco

    Rossco Greetings Earth Creatures

  5. Rossco

    Rossco Greetings Earth Creatures


    Thanks gents, turned out to be a stuck float needle, small piece of teflon wedged in there. Float level now set just under half way up the float glass.
    johnriv67 likes this.
  6. Bens99gtp

    Bens99gtp Well-Known Member

    Love being right.......dont ask me how I knew teflon would be there
  7. Rossco

    Rossco Greetings Earth Creatures

    OK I wont...........nope still not going to ask............oh go on tell me!!!!
    johnriv67 likes this.
  8. Bens99gtp

    Bens99gtp Well-Known Member

    Well......I dont normally use teflon tape, I use the liquid stuff.

    I was work on the 90 as truck we did a few years ago, putting a nice about 650hp aluminum headed 502 in. The customer very adamant about only using this blue color very thick tape on the fitting. He provided it and said he has had nothing but trouble with all other forms........the bypass regulator was pipe threads so 3 wraps on each fitting per his very specific instructions.

    About a week later after he gets it back he has your complaint, so I drive the hr to his house, pull the needles to find both full of blue tape that clearly got cut during the install.

    So a quick clean up, and he was back underway
  9. Schurkey

    Schurkey Silver Level contributor

    Teflon (PTFE) tape has NO place in a fuel system; or an oil system. If it doesn't shred and cause problems when'll shred and cause problems when disassembled.

    God Bless Loctite/Permatex "PST", Pipe Sealer with Teflon. The important part is that it has an anaerobic chemical like a thread-locker in addition, so that it HARDENS (not just "dries") in the absence of air. FANTASTIC stuff. There's multiple versions: "High heat", low strength, slow-setting, etc; and they all work. The three most common are #565, #567, and #592. 592 is the easiest to source around here, and generally costs a little less than 567.
  10. Rossco

    Rossco Greetings Earth Creatures

    Interestingly I didn't use PTFE tape, I used loctite.

    I'm assuming the Teflon came from the fuel line which is Teflon lined
  11. Schurkey

    Schurkey Silver Level contributor

    Steel-braid-over-Teflon (PTFE) liner?

    Stray pieces of Teflon are possible, but somewhat rare. Even more rare if the hoses are cleaned-up after assembly by blowing compressed air through them. We had a steel-bladed saw (think of a table-mounted fixture with a circular saw using a sharp, steel blade having no "teeth".) When the blade got dull, it would make more-ragged cuts with bits of rubber or Teflon left inside the hose.
  12. Rossco

    Rossco Greetings Earth Creatures

    Yes, it was a small sliver no more than 0.020"
  13. Bens99gtp

    Bens99gtp Well-Known Member

    Glad you found it and was an quick repair
  14. LARRY70GS

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

    That's what I like about AN fittings, no need for thread sealer at all.

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