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I don’t know if a plastic tank is safe or practical for outboard fuel tank, but there are conversion kits to change a new style safety spout type to an old style free pouring with separate vent. Possibly sold at Tractor Supply or Harbor Freight stores.
My choice for a spout, for the plastic 1 & 2 gal. gas containers I use for my motors, that have tanks on them, is the Midwest Quick Flow Spout– with modifications. The gas stops flowing when it gets to the tip of these spouts. First I take out the red lock. The small tab on the spout isn’t big enough the keep the spout from sliding off. I put a hole in a cap from another container with a friction fit on the spout. Adding caps controls the level in the tank when the fuel stops. Helpful in really small tanks like Pal’s, Cub’s, ¾ hp WW,ect. Need to lubricate the spout with some oil in the spring. When plastic tanks expand, when they get warm, and contract when it gets cooler, air is not moving in and out of the tank. It’s also not letting in the moisture that’s in the air, into the tank, that leads to water in the gas, and rust inside metal tanks.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
