Buy Another Tank
Nathan: There are times that we take our boat 35 miles to meet-up with other members of the fleet that we cruise with. This is further than our boat will go on 6 gallons of fuel. When you say that you are carrying a plastic gas can, I assume that you mean a can that is meant to fill something like a lawn mower. We carry boat 2 boat fuel tanks in our vented compartment, and the only time I ever smell anything is when I first unscrew the vent, if the can is under pressure. I recommend that you keep your 2.5 gallon can at home, and get another 3 or 6 gallon fuel tank for your boat with the hoses on it. You can then change from one tank to another without any problem. These tanks seal just fine with the little stainless steel ball valve in the connector, and the screw down vent on the lid to the gas cap. If you spend a little money, you will be a lot happier, and safer. With what you have, you would have to transfer fuel from the can to the fuel tank anyway. That sounds like a mess to me, and probably isn't that safe. When I do transfer fuel from one tank to another, (which I don't do on the boat), I have a male connector with about a 1 1/2 feet of clear hose one it, that I plug onto the connector at the end of the hose from one tank, and put this into the other tank and pump it to get the flow started and let gravity do the rest. I put the tank that I am draining a few feet above the other tank and siphon the fuel into the lower tank, using the hose already on the tank. This is certainly worth doing. Aldo