Anyone using bladders for fuel tanks ??

[clunan1]

Heck, give it a try. Old boats have fiberglass tanks, while some boats have plastic tanks. Just make sure it's a 100% money back guarantee, if this thing blows out on ya. If they can withstand the abuse of race boats, then surely they can withstand a cruising/fishing boat.

[aormond]

Looked at them real close when faced with cutting out the fiberglass tank in the bert to support Iowa farmers, in my case though the capacity was an issue (I wanted more not less) and the fine print was a suggested replacement was something like every 5 years and pulling out the cockpit deck the on a regular basis just wasn't in the plan. Disclaimer: that was 4-5 years ago. Al.

[mlee1959]

Its not a bad idea. A lot of airplanes use bladder tanks tucked in between the aluminum ribs. And it doesn't get any more flammable than Aviation gas. I've helped change a few [they get old and cracked and leak] and its not that hard. A big tank can be folded up to get in a small access hole. The baffles in the original tanks must be removed and the seams taped, though.

On the down side- the bladders that I have helped install all had snaps at various places on the top, bottom, and sides to keep them from collapsing as fuel is used. Its going to be hard to put in something like those. Also--I saw a dirt dobber in a fuel vent bring down a spray plane one time because the bladder collapsed over the fuel outlet as fuel was used.