Hey guys, don't throw the baby out with the bathwater. Are your plans to race, circumnavigate the world or go out and have some fun. Here are a few ideas good or bad but at the end of the day should get you out on the water.
IF you are considering the boat a total loss anyway, what can it hurt.
1. At the end of the day so what if it leaks.... Is the tank emptying out total, or just enough water to make a mess leaking into the bilge? If it is a reasonable amount just enjoy the boat until you can't anymore.
2. Do you trailer the boat? IF not, or even if you do cut a hole in the top of the tank where the vent is and fill it with weight. Cement, rocks, lead, mother-in-laws, whatever you have for dead weight. You may not have to put a full 1500lbs in but maybe enough to get the leak tamed.
Good luck on whatever the outcome and I look forward to following this link.