[lakeroadster]

Well it would appear that I have lead you astray. I assumed (read: ASSUME) that your tank was the same as my 65. I just looked at the LMC catalog and I am wrong! I hate it when that happens.

I apologize for the confusion.

I had a problem with the valve cover oil fill cap sealiong tight on my old Ford Roadster and made a washer using a piece of hard plastic, basically a donut. I then cut through one side of the donut and slid it behind the cap gasket. That added jsut enough thickness to get the stock seal to work.

You might try that, or try doubling up on gas cap gaskets to see if that might work? Or maybe making your own gasket out of something a bit thicker and softer? If your using the stock cap the seal may be hard and compressed due to age to the point that a new one would help, like CDOWNS eluded to in an earlier post.

Hope that helps, good luck!