Originally Posted by a64pilot
Just I have been told to leave it completly full until you intend to use it, then drain it into one of your main tanks, a half full bladder tank in heavy seas may not be safe.
Just a comment: might not be all that easy to safely and cleanly transfer boatloads of fuel from a bladder to the main tanks. Might need some thought about connection hoses, fittings, etc... and would maybe depend somewhat on where the tank fills are located.
There are some large, hard-sided portable fuel tank/pump combos, sometimes on wheels. Moeller I think, or similar. Likely not easily managed; maybe couldn't fill first and then lift
the suckers into the cockpit
due to both weight and shape. Might have to fill in the cockpit
instead, but then something like that might make it easier to transfer to main tanks.
FWIW, we extend our range by slowing down to trawler
speed... when sea states and so forth permit
. Not a particularly elegant solution, but it's cheap
and (usually) easy.