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Thread: Weather-proof around fuel cap

  1. #1
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    Weather-proof around fuel cap

    From the photos in the supplemental section, the fuel cap seems to lack a seal around it to prevent leaking around it when it rains. I know this is a fair weather vehicle but I still would like to keep the trunk dry when the is inclement weather. Does any one have suggestions for weather-proofing the gas cap?

  2. #2
    Senior Member edwardb's Avatar
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    Your cap should have come with a rubber gasket that goes between the outer flange and the body. That gasket, combined with the ring of mounting screws, makes it a tight seal. It shouldn't leak.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
    Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
    Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.

  3. #3
    Not a waxer Jeff Kleiner's Avatar
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    Quote Originally Posted by edwardb View Post
    Your cap should have come with a rubber gasket that goes between the outer flange and the body. That gasket, combined with the ring of mounting screws, makes it a tight seal. It shouldn't leak.
    This is on an FIA Paul which is a different configuration where the cap mounts to a pedestal, not the body. I'd be tempted to use the sticky, gooey expanding foam that FFR intends for the area in front of the doors and place it so that it could fill the void but back far enough not to be visible from above.

    Good luck,
    Jeff

  4. #4
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    Check any intended product for resistance to gasoline. Some products will dissolve almost instantly, while others won't. I'd have to see a picture of the setup to comment.

    I have a body mounted marine flip top cap and didn't want an ugly gasket, so I used some permatex #2, fuel resistant and nonhardening sealer. I also made sure that the body was perfectly flat where the cap mounted.

  5. #5
    Senior Member edwardb's Avatar
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    Quote Originally Posted by Jeff Kleiner View Post
    This is on an FIA Paul which is a different configuration where the cap mounts to a pedestal, not the body.
    Oops. My bad. Saw that it was an FIA but didn't know that detail was different. You know what they say about assuming.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
    Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
    Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.

  6. #6

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    Why not mount it to the body as per Erik and Eric on their 289s. That is what I am doing.

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