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Fuel and oil tank cap seals

I'm looking for some advice on fuel and oil tank cap seals. They both leak on my BSA M20.

I've seen cork 2 and 2.5" seals on eBay but the fuel cap seems to be 3".

Is it a case of DIY cutting only?

Thankyou in advance.

Re: Fuel and oil tank cap seals

I couldn't tell you what the sizes are but I make seals out of cork, they work fairly well & are easy to do. Is it possible to get perfect sealing with these old tank caps?

Re: Fuel and oil tank cap seals

I have found leather to be the best for making seals...Ian

email (option): ian@wright52.plus.com

Re: Fuel and oil tank cap seals

Thank you. What thickness would be recommended?

Re: Fuel and oil tank cap seals

About .040"-.060" (1-1.5mm) and a reasonably stiff leather if you can find some....Ian

email (option): ian@wright52.plus.com

Re: Fuel and oil tank cap seals

Thank you!

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