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  • Fuel Gauge

    My fuel float sticks.

    I think it must be because CF-CLR is so fast!!?

    Seriously though, It sticks showing more fuel than is actually there. I do my range calculations based on fuel burn and time but even so I'd like it to work.

    Any suggestions?
    thanks
    S
    Scott
    CF-CLR Blog: http://c-fclr.blogspot.ca/

  • #2
    The cap guide rod should have quite a bit of clearance I have found in the past or it will stick as you say. Over the years I have made a few for cubs and T-crafts and had to drill out the guide a time or two to get it to follow the fuel consistently. Maybe yours is too close on the tolerance. Should be a little sloppy.

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    • #3
      I have also found it needs clearance to move. Your wire may be too large of a diameter or the fitting on the cap is too small. It can periodically hang-up even when right, but once you slow down a bit it should drop.
      Cheers,
      Marty


      TF #596
      1946 BC-12D N95258
      Former owner of:
      1946 BC-12D/N95275
      1943 L-2B/N3113S

      Comment


      • #4
        The wire i have is probably 063 or so and the i/d of the tube is about 5/32. I was actually thinking there might be too much clearance.
        Scott
        CF-CLR Blog: http://c-fclr.blogspot.ca/

        Comment


        • #5
          To much clearance might let the wire cock to much in the tube causing it to stick. I suspect that there is a ratio for the length of the tube compared to the difference between the diameter of the wire and the ID of the tube that is ideal, but I don't know what that is.

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          • #6
            You also need to be sure the float wire is VERY straight. Even a little curve can make it stick and any "fixed" kink will make it stick like mad. I replaced my wire with a piece of stainless steel welding rod. If your rod is mild steel (like the coat hanger wire I saw on one) a little rust will also make it stick. Running a drill bit through the cap hole (I would do it by hand) also seems like a good idea. A slight bend in the tube could also cause problems.

            Hank

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            • #7
              Been flying 2hr 30 trips from uts to aqo and found that main tank float will stick at times straighten wire install new cork been working ok - have had trouble with aux tank draining into the main tank
              found vent tank cap with straight vent was problem curve vent forward fix the problem best to fly buy the clock on fuel usage it is good to visual aid also

              Comment


              • #8
                I am flying three different planes and the one thing they seem to have in common is the fuel gauges. I don't trust ANY of them (all three Cessnas by the way, my 41 T is down for maintenance). All three read LOW at the start so I ALWAYS climb up and VISUALLY check that the tanks are full. I also use very conservative fuel flows so I ALWAYS land with more fuel aboard than I planned for. Nothing as useless as fuel left on the ground....unless of course if you are on fire.

                Comment


                • #9
                  Originally posted by McRay7ac View Post
                  ... uts to aqo ...
                  (my snip)

                  I'm lost as to what this means, McRay7ac, are these places? Or possible finger trouble?

                  Rob

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                  • #10
                    Originally posted by Robert Lees View Post
                    (my snip)

                    I'm lost as to what this means, McRay7ac, are these places? Or possible finger trouble?

                    Rob
                    My guess places. Huntsville, TX and Llano, TX 158.4 nautical miles apart.

                    Comment


                    • #11
                      I utilize synthetic cork, (got it from the Model A online catalog), takes two of them stacked. Works great and may have a little more weight than cork. Never have to worry about degradation. https://www.snydersantiqueauto.com/gauge-float-only
                      Cheers,
                      Marty


                      TF #596
                      1946 BC-12D N95258
                      Former owner of:
                      1946 BC-12D/N95275
                      1943 L-2B/N3113S

                      Comment


                      • #12
                        I like that idea
                        thanks Marty
                        Scott
                        CF-CLR Blog: http://c-fclr.blogspot.ca/

                        Comment


                        • #13
                          My problam is just the opposite. I have a new "cork" -- neoprene-- from Wag Aero, and it wants to rest on bottom of tank. It is hard for me to believe that the rod is too heavy. ??????? I'm using an old original '46 BC12-D gas cap.

                          Comment


                          • #14
                            I had the wag, junk, 5 different ones from them have failed, 2 from me, 3 from customers. Get a Univair J3 unit, it is a black plastic looking float that doesnt fail and fits perfectly and is the correct length. It also doesnt stick. Tim
                            N29787
                            '41 BC12-65

                            Comment


                            • #15
                              I bot the Univair J-3 unit and it works perfectly. thanks for the tip.

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