Petrol gasket material / goo

[gpigeon]

Any suggestions as to a suitable gasket material and/or goo for a petrol fuel tank.
I need to refit the sender unit to the top of a flat tank.
Modern silastic jointing goo is not recommended????
Cheers.
Bill W.

[Blknight.aus]

ATV RED

[Sprint]

stag

[d2dave]

Permatex Aviation

Dave