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I have a 37foot cat with lifting outboard(s) and have made ocean passages.

The tanks do require occasional changing and re-filling at sea that I try to do in calm conditions and try to only motor in calms with the outboard(s) up when it is rough.

I put a gerry can on the cockpit seat above the portable tank and use a siphon hose to fill the portable tank at sea.? The siphon hose unit I have has a copper fitting with a marble inside at one end with a 6foot x 1/2" diameter hose attached.? To start the siphon the marble end of the hose is put to the bottom of the full gerry can and jiggled up and down a few times to start the siphon and lifted out of the gerry can when I want to stop the siphon.? There is no spillage unless you allow the tank to overfill.

I carry a couple of these units, one for water and one for fuel, as they are light and only cost $10-15.00 each.

They are variously called:

Shaker Siphon;, Moeller Siphon Pump; EZ .5" x 6" siphon hose; Shoreline Marine Easy Shake Siphon Hose, etc.

Available at Canadian Tire, Walmart, etc.

I have been using these for fifteen years and the only maintenance is to change the hose every five years or so as the fuel eventually hardens the hose.

I wouldn't go cruising without them.

Paul Howard