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Thread: Fuel Sender O Ring Placement

  1. #1
    Registered User WDILL's Avatar
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    Default Fuel Sender O Ring Placement

    I need info on the correct position of the fuel sender O ring. The schematic shows it between the sender and lock ring. Some posts discussed ways to keep it from slipping when tightening the lock ring but I also read a post saying the ring goes between the tank and fuel sender, then the lock ring.
    Wally Dill
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    No more body roll! SteveJ's Avatar
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    I used vaseline to hold the o-ring in place.
    73 240Z
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    Still plays with cars kenz240z's Avatar
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    I believe the o ring goes between the tank and the sender. The tank is 'grooved' for the o ring. I've replaced a few and had no issues with keeping the o ring in place when putting the sender unit back in.
    Kenny P.

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    Marooned Fish cygnusx1's Avatar
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    I believe there is a metal "tab" that is part of the tank bung, that helps hold the o-ring in place. A non petroleum or synthetic grease is a good idea too. Some greases can dissolve some o-ring materials.
    Dave C, Putnam, NY
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    No more body roll! SteveJ's Avatar
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    My line of thought was that if the o-ring has to stand up to gasoline, it probably was not very susceptible to deterioration by petroleum based products.
    73 240Z
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    Marooned Fish cygnusx1's Avatar
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    This should be true and probably is true with OEM stuff. You never know with the replacement stuff.
    Dave C, Putnam, NY
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    Quote Originally Posted by kenz240z View Post
    I believe the o ring goes between the tank and the sender. The tank is 'grooved' for the o ring. I've replaced a few and had no issues with keeping the o ring in place when putting the sender unit back in.
    I recently replaced mine, this is correct.

    The O-ring is petrolium resistant, so use a heavy petro based grease to hold the Oring in place and prevent tearing it if the sender moves durring lock ring installation.

  8. #8
    Registered User WDILL's Avatar
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    Thanks everyone for the information. I would be completely lost without this web site.
    Wally Dill
    1970 240Z VIN 3435, white with light blue interior
    Under Full Restoration

  9. #9
    Registered User cesar280z's Avatar
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    Cygnusx1 is right, between fuel tank and unit
    Attached is a picture, I recently
    replace my fuel tank
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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