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Black film on the inside of gas tank

Discussion in 'Norton Commando Motorcycles (Classic)' started by Joe Schlaberdowski, Aug 18, 2019.

  1. Joe Schlaberdowski

    Joe Schlaberdowski

    Joined:
    Jan 1, 2017
    I recently dumped old gas out of my tank and in the process held it after with my finger in the lip of the open tank. My finger came out black, like with black grease. No reason for that I can think of. The inside is actually white with some sealant coat -- which is starting to peel by the way, though not plugging the wire mesh over the taps or getting into the mikuni carb. Now, the film came from the top of the tank by the gas cap.
     
  2. Yakatak

    Yakatak VIP MEMBER

    Joined:
    Apr 5, 2017
    Deteriorated cap gasket?
     
  3. Joe Schlaberdowski

    Joe Schlaberdowski

    Joined:
    Jan 1, 2017
    At work right now. I'll check when I get home. But the thin black greasy film would have had to migrate at least to where my fingers could reach. Could be. I'll check.
     

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