My Avistar's fuel tank compartment was very well fuel proofed from the factory, as was the firewall and back into the servo compartment. No chance of fuel soaking into anything up there. The front couple of formers are a very tight fit around the tank, so it's best to stick with the same general shape of tank. I think World Models sells a tank that's almost a direct replacement, just trash the stopper that comes with it and get a Du Bro or Sullivan replacement.


Andy