Fuel tank is in my vintage beetle. It seals really well, which is good. I now know that it didn't before. I also know that the venting system is blocked. :-(
Tank in:
Fuel filter installed in front (and all new hoses)
And another at the back, between the tunnel hard line and the engine.
The Superbeetle fuel level sender has two floats, and is kind of tricky to get in through its hole in the tank, but after a little fiddling, I got it.
The engine all ready to go!