It sounds like we're talking about gasoline...
Normally fueling at the dock
you shut down, and I assume you won't want to do that at sea.
As you fill the tanks
, a cloud of gas vapor is leaving the tank. If that is near the intake for the engines it could draw explosive vapor into the engine
room. Turning on the bilge
blower might make it worse. (Draw in even more)
An auxiliary tank or bigger tanks
would be better and safer. If you're going twice as big or more you should talk to a stability expert. You can get fuel
bladders made to fit odd shapes. I've only used them with diesel
, but about $1/gallon to have built for a big tank
Whenever I think of myself as an expert on anything, I think of this old definition:
X is a mathematical unknown and spert is a drip of water
Therefor expert must be some unknown drip under pressure.