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Fuel tank lid gasket material

Discussion in 'Engines' started by Jim Price, Dec 4, 2025 at 1:36 PM.

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  1. Jim Price, Dec 4, 2025 at 1:36 PM
    #1
    Jim Price

    Jim Price New Member

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    Hi everyone,
    I have followed this forum for a while and appreciate the deep knowledge base herein. I'm looking for some advice.
    I have to replace the gasket between the fuel tank lid (26"diameter) and the tank itself. Everything is steel. The old gasket, 20 years old, deteriorated to pieces and dust plugging all the filters on the boat. Is nitrile rubber the best replacement material for the gasket?
  2. Capt J, Dec 4, 2025 at 5:26 PM
    #2
    Capt J

    Capt J Senior Member

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    Is it gas or diesel?
  3. rtrafford, Dec 4, 2025 at 8:45 PM
    #3
    rtrafford

    rtrafford Senior Member

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    I made gaskets using rubber gasket sheets and treated both sides with Permatex Permashield (fuel resistant) for my diesel tanks. No leaks, no odor, no problem.
  4. Jim Price, Dec 5, 2025 at 5:55 AM
    #4
    Jim Price

    Jim Price New Member

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    Diesel
  5. captholli, Dec 5, 2025 at 2:23 PM
    #5
    captholli

    captholli Senior Member

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    Nitrile or Buna - N is the recommended gasket material in sheet goods for diesel tank applications. I wouldn't use anything else.
    rtrafford and Capt Ralph like this.
  6. rtrafford, Dec 6, 2025 at 2:27 PM
    #6
    rtrafford

    rtrafford Senior Member

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    Yes, Nitrile sheets.
  7. Jim Price, Dec 8, 2025 at 8:46 AM
    #7
    Jim Price

    Jim Price New Member

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  8. rtrafford, Dec 8, 2025 at 9:04 AM
    #8
    rtrafford

    rtrafford Senior Member

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    My first pass was without the Permatex. Fuel found the fine little grains in the aluminum and escaped. Had to revisit.