Wannabe, I see in your profile you have a Bavaria
37. Are you asking for a friend or buying
a Tayana? Iíve posted about my tank solution before but Iíll try again here. Other people have used various mending putties inside fuel tanks
which I did not try. Some have cut the old tank into pieces to get it out and put several smaller tanks in place. I opted to insert a bladder into the old tank.
Like many boats the tanks in a Tayana 42 are installed before the interior
is built in place. That makes getting a leaking tank out and a replacement tank in very difficult and requires substantial demolition of the beautiful interior
woodwork. I decided to go the route
of inserting a high quality bladder inside the existing black iron tank.
I did this after one of my black iron diesel
tanks developed a pin hole leak in the lower outboard
welded seam of the tank. Fortunately, it was the starboard tank which is under the galley
but has some access panels
in the sole above the forward part of the tank. On the port side there arenít any access panels
in the sole above the tank except at its forward end by the nav table.
In addition to opening up the top of the tank you have to remove any baffles in the tank and grind them down smooth so as not to have any chafe on the bladder. I also padded the inside of the iron tank with rubber decking tiles before inserting the bladder. You want a high quality bladder tank builder
to manufacture one to the exact dimensions of the inside of your existing tank so you need to measure the rhomboid shaped tank very carefully.
I used Aero Tec Laboratories, Inc.
Ramsey, New Jersey
Cost was $1296 in 2004. That was in addition to the cost of grinding out the baffles in the iron tank and installing the bladder.
Since 2004 Iíve had zero problems with the bladder inside the old tank.