Fuel tank inspecton cover

[Cadstat]

Some say to use the gaskets under the fuel tank covers T-708, some say just proseal metal to metal. I removed mine this week end and the original builder used gaskets and proseal. They weren't leaking but popped off easily.
How would you go back?

[flion]

You can get new gaskets from Vans. I put a coat of Fuel-Lube on mine before I used them; I've replaced them when I re-plumbed the right tank for a return line and no leaks before or since.