Gas tank patch repair

[benXJ]

I'm working on a 1967 M715 fuel tank, trying to salvage it cause new ones are not available.

I want to cut an access hole into the top to work on the fuel pickup tube (its not removable or accessible down thru the sender hole....too small)

I want to close this access hole up with a removable piece of metal so I can get back in there when I need to

My plan was to cut a sheet of regular steel slightly larger than the access hole, the same thickness of the tank, and screw it down with self tappers. This is not a race car, its not pretty, and it just needs to hold the fumes in.

I'm thinking I'd need a seal of some sort. What can I use that will hold the fumes in and not break down due to the gas fumes?

Cork? Neoprene like this?

https://www.amazon.com/Exactly-Rubber-Neoprene-Sheet-Durometer/dp/B0B47MG795/ref=sr_1_4?adgrpid=183607482702&dib=eyJ2IjoiMSJ9.QbyYVSiWmLPuC_IXlPO1nj1P-IkknPLTPU1dN9M1j-n7gMHTCoo0XoO74XqBnS1VKo2UU2QNi4BwWN_i69tSgLEVayagUyh7lkoDxOqtRR2a8jEuOt4fvMPRwWHY-MjzdXwlQq5vufuddJiALE0SfdVX0mCSVqAvdSCSYY0cUegvIWwBAfLoTCRcR_b6Tbav1GXDlxnOLxWGepWu3k_Fr1B7A4riocHrijbrWTgV26o.fU-ZFR-Qni_LeoAjwp37FUSlxRYQy8svN3x82IewTKs&dib_tag=se&hvadid=779576467435&hvdev=c&hvexpln=0&hvlocphy=9197851&hvnetw=g&hvocijid=6966371892505368964--&hvqmt=e&hvrand=6966371892505368964&hvtargid=kwd-400387970054&hydadcr=7529_13573379_69615&keywords=gasoline+resistant+gasket+material&mcid=cfb29d7272d83383ad0feb218c118e2b&qid=1764952559&sr=8-4

Thanks!

 

[Joe_U4]

Cork, it's what is used on most fuel cell sending units. You can buy a sheet and cut it to the pattern you want.

 

[Shreddinlettuce]

Permatex #2 non hardening sealant is good for gas applications

 

[awheelterd]

Permatex #2 non hardening sealant is good for gas applications

Just used some to seal the fuel pickup on my 20yr old four-wheeler. Been a week and no leaks yet.

 

[Shreddinlettuce]

Mine is still pliable 3 years later