Which resin is the best for sealing diesel fuel tank?

[Boathook]

The more threads and posts I read about leaking fuel tanks, leads me to thinking that the tank should be got out of the boat before attempting repair. This assumes that it isn't a leaking hose joint, etc. Most tanks of any size have baffles in them which will make cleaning very nearly impossible for any type of sealant to work correctly. There is the issue as to why the tank failed to cause the initial leak and how many are waiting to start leaking.
Yes, there are exceptions, but they seem few. It does seem to be the 'newer' boats have the most problems with tanks and engines installed before the superstructure goes on, some builders not seeming to care about maintenance / renewal many years in the future.

 

[PetiteFleur]

I had to fix this problem when I bought our boat years ago. It was steel and leaked, the previous owner had tried sealing it with something which obviously didn't work. I had to cut up into 3 pieces to get it out(I later found out that the tank was installed before the engine was fitted) I had to replace all the supporting timber as it was soaked. Replaced with a plastic tank of 91 litres which was half the capacity of the original, still keeps the engine running for over 24hrs. I also fitted the calorifier in the extra space which freed up a cupboard in the galley.

 

[PCUK]

What about the baffles ?

Take them out - obviously!