I sold a lot of them in the eighties. The customers would buy a big bladder tank, a #410 chart and pay with $20 bills. Seriously they do work
well. Just give some thought to chafe protection and securing them. I've heard of one guy who put a big bladder tank on the bow of his big sport fish boat
. He tied it with light lines. When he got into a bit of sea, it rolled off. There he was in the open ocean with most of his fuel
floating in a big balloon next to him. That's a good story whether it's true or not!
Reverso sells some really nice gear
pumps to transfer fuel. Don't buy it from their web site, buy from a dealer to get a better price
Reverso Diesel Transfer Pumps