Check your fuel line connections where they attach to the tank, as well as the lines themselves... If the connections are tight and the lines are sound then you have a problem with 3 possible solutions.
1) Replace the tank
2) Repair the tank
3) use portable tanks
Each has it's good and bad points.. Replacing it involves a lot of work. Repairing it is just as much work and is the least attractive in my estimation. Using portable tanks involves storing them and taking up space on the boat.
So the choice is yours. Good luck.
PS...if you should go the replace tank route, there are a lot of guys here that have done that job and can help with suggestions, etc.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God)
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.