The previous owner of my Bavaria 38 had an Eberspacher heater fitted. The connection to the fuel tank was poorly made and involved introducing an inspection hatch to top of tank. The tank has become a little warped on top leading to leakage around the hatch. I think options are to weld PE sheet over the 6 inch diameter hatch hole or replace the tank. I would be pleased to receive advise as to most practical and cost effective solution. With thanks in anticipation.