Announcement

Collapse
No announcement yet.

Fuel fitting sealants or ideas

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Fuel System: Fuel fitting sealants or ideas

    OHV Champ 6 with Carter fuel pump. The way these pumps are clocked, the outlet is about 30 degrees from perpendicular to the block, and a 90 degree brass fitting is needed to get the outlet pipe on. At least I see no other option.

    Here's my problem: This is an original remanufactured pump ( ethanol safe) that works fine. I need a 90 degree brass fitting to get the outlet pipe connected. There is only one position where the outlet pipe fits, and either it's too loose and leaks, or gets so tight 180 degrees from there, that I am afraid I will crack the fuel pump if I go further. Who knows how many times these parts have gone together and come apart, wearing away each time.

    What solutions can anyone offer?
    Ron Dame
    '63 Champ

  • #2
    What's worked for me on female threaded fuel pumps is to use a NPT tap to open the threaded hole just a bit more so the fitting will clock correctly. Coat the tap with grease so it will retain the very few shavings. Tap, try the fitting. Turn the tap a bit more, try the fitting.

    jack vines
    PackardV8

    Comment


    • #3
      Oh, I like that idea!
      Ron Dame
      '63 Champ

      Comment


      • #4
        DON'T use Teflon tape.
        Even plumbers, that it was made for...don't use it in most cases (as told to me by a...plumber !)..!
        If you want to use teflon, use Teflon "paste".
        If you feel the need to use a sealer, just use a little, non-hardening gasket sealer.
        Me, for the last 50 or so years, I've just used...engine oil..!

        I can't count anymore how many people that I've helped with oil or fuel pressure problems...and ended up finding Teflon tape in the system..!

        Mike

        Comment


        • #5
          Originally posted by Mike Van Veghten View Post
          I can't count anymore how many people that I've helped with oil or fuel pressure problems...and ended up finding Teflon tape in the system..!
          Mike
          It was clearly not installed properly. Very common.

          Comment


          • #6
            I have used hylomar successfully in these situations.
            78 Avanti RQB 2792
            64 Avanti R1 R5408
            63 Avanti R1 R4551
            63 Avanti R1 R2281
            62 GT Hawk V15949
            56 GH 6032504
            56 GH 6032588
            55 Speedster 7160047
            55 Speedster 7165279

            Comment


            • #7
              I finally cried Uncle, and pulled the fuel pump off. Strange how awkward the forward bolt is to access.

              What I found is that the fitting is bottoming out before the NPT threads seal, so I went to my junk bin and pulled several other fittings regardless of the outlet end, and all did the same. So the pump body threads are worn too much. This is an original Carter that has been rebuilt with ethanol resistant parts, so I hate to trash it. We've already discussed the pitfalls of teflon tape, I'm not sure teflon pipe dope is any better in this instance, and not only are there no Helicoil pipe thread inserts (AFAIK) I doubt that will seal.
              I'm leaning towards JB Welding the fitting in place. Pro's? Cons? better ideas? Would Hylomar handle a loose connection well without it moving around?
              Ron Dame
              '63 Champ

              Comment


              • #8
                Originally posted by Ron Dame View Post
                I finally cried Uncle, and pulled the fuel pump off. Strange how awkward the forward bolt is to access.

                What I found is that the fitting is bottoming out before the NPT threads seal, so I went to my junk bin and pulled several other fittings regardless of the outlet end, and all did the same. So the pump body threads are worn too much. This is an original Carter that has been rebuilt with ethanol resistant parts, so I hate to trash it. We've already discussed the pitfalls of teflon tape, I'm not sure teflon pipe dope is any better in this instance, and not only are there no Helicoil pipe thread inserts (AFAIK) I doubt that will seal.
                I'm leaning towards JB Welding the fitting in place. Pro's? Cons? better ideas? Would Hylomar handle a loose connection well without it moving around?
                Because it's a tapered thread, how about trimming off a thread or two from the fitting to get to a wider area of threads. If there's not enough length, try finding a new brass one at a local store that might have more threads.

                I like Permatex better than Teflon for these issues also.

                Bob
                Last edited by sweetolbob; 05-09-2021, 04:19 AM.

                Comment


                • #9
                  Could you retap for a larger fitting? Maybe something metric.
                  78 Avanti RQB 2792
                  64 Avanti R1 R5408
                  63 Avanti R1 R4551
                  63 Avanti R1 R2281
                  62 GT Hawk V15949
                  56 GH 6032504
                  56 GH 6032588
                  55 Speedster 7160047
                  55 Speedster 7165279

                  Comment


                  • #10
                    Permatex Aviation has been successful for sealing my fuel leaks. Even in cases where I was unable to get one last quarter turn to get a snug fit. Never a leak!
                    1963 Studebaker GT Hawk R1 63V-33867
                    1964 Studebaker Avanti R1 R-5364
                    1970 Avanti II RQA-0385
                    1981 Avanti II RQB-3304

                    Comment


                    • #11
                      Ditto on aviation Permatex. Don't overdo any sealant. Don't think Teflon tape is the problem--the problem is how it is applied. I should be applied over the threaded area only . Great idea with the tap!

                      Comment

                      Working...
                      X