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Avanti vent line... early 1963

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  • Fuel System: Avanti vent line... early 1963

    Was there a running change in the location of the vent /overflow lines? The connections on my tank are not in the same place as shown in the Bob Johnstone's web page, especially the vent connection which is dead center on my tank, instead of to the side on his photo.

    Further, the vent line runs up into the left pillar, then back down and through a hole in the tank floor, instead of the right wheel well as described on that page. My issue is gas fumes in the cabin that I cannot locate. Should I re-route this line?
    Ron Dame
    '63 Champ

  • #2
    From what you said, there are likely many things on early cars that were redesigned. The later vent routing is more common and takes the fuel/vapors outside the cabin. (Over the passenger side rear wheel) Fuel odors inside are usually caused by leaky tanks, sender seals or rotten hoses. Exhaust odors are generally caused by a bad trunk lid seal. If it can be "seconded", I'll update the page with your info.../ thx
    64 GT Hawk (K7)
    1970 Avanti (R3)

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    • #3
      Thanks! I assume this is Bob? The car is R1092.

      Anyway the hoses are all new, as is the fuel sender seal (the tank was removed and I had it flushed when I bought the car). I decided just to try moving the vent hose to the wheel well. BTW, I corrected my original post, the vent hose goes up the right pillar before dropping down through the floor.
      The return line is in front of the filler pipe, rather than behind, and there is no right side upper drain.

      Also, the seat bottom is secured by screws through a rubber bushing in the floor, these are long gone, so I taped over those 1/2"holes to prevent fumes from coming in there. I had no seal between the fiberglass seat back and the body, so will reinstall with some sore of removable sealant when I put it back in.
      Last edited by Ron Dame; 06-08-2019, 07:54 AM.
      Ron Dame
      '63 Champ

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      • #4
        When do you smell gas. Car setting, running, driving. More odor in back or front. It might not even be the gas tank depending on when and location. Do you have a vented cap? Windows open or closed? Bob

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        • #5
          Especially driving, but worse with a nearly full tank. This is an R2, and the return line is not leaking. My guess had been sloshing of the fuel since it is worse with a full tank. Sure, there is a bit when sitting, not unusual for modern fuel, but not strong. I've dusted every hose and line with baby powder, none of it shows any evidence of leakage. I'd say it is all coming from the back, it is NOT under the hood. I'll report back after moving the vent hose to the wheel well and driving around with a full tank. I'll leave teh seat panels out and watch for problems too.
          Ron Dame
          '63 Champ

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          • #6
            Is the vent hose new? It will not leak fuel, that would be detected by your powder method, but could still leak fumes.
            Most fuel lines leak where they are clamped and these leaks are hard to see/detect.
            Gary L.
            Wappinger, NY

            SDC member since 1968
            Studebaker enthusiast much longer

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            • #7
              All of the hoses, including the filler hose are new...but not the vent hose which doesn't appear cracked, but also is not under pressure. I hear, and can imagine, that where it loops up into the pillar is a bear to change, but maybe that will cure it.
              Ron Dame
              '63 Champ

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              • #8
                Originally posted by Ron Dame View Post
                All of the hoses, including the filler hose are new...but not the vent hose which doesn't appear cracked, but also is not under pressure. I hear, and can imagine, that where it loops up into the pillar is a bear to change, but maybe that will cure it.
                I was referring to the hard lines, not the soft hoses, when I mentioned clamps. Not where they clamp/fasten together, but where they are held to the frame with clamps.
                Gary L.
                Wappinger, NY

                SDC member since 1968
                Studebaker enthusiast much longer

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                • #9
                  Well, well, well. I made notes, but it turns out they are as faulty as my memory! I must have meant to replace the filler hose, not that I had replaced it.Click image for larger version

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                  Ron Dame
                  '63 Champ

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                  • #10
                    Looks like that may have been your gasoline smell. Glad you got it figured out.

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                    • #11
                      Originally posted by Ron Dame View Post
                      Well, well, well. I made notes, but it turns out they are as faulty as my memory! I must have meant to replace the filler hose, not that I had replaced it.[ATTACH=CONFIG]81636[/ATTACH]
                      I am glad that you located a problem. This points up the difference one letter can make - "change" vs. "changed".
                      Gary L.
                      Wappinger, NY

                      SDC member since 1968
                      Studebaker enthusiast much longer

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