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I am working on my 1961 Whaler and want to weld up a gas tank to go above deck, (under the seat). I am new to this so here is my question:

Would the tank just need a fuel neck, a vent, and an outlet? I'm thinking of welding the outlet under the tank and drilling a hole so the outlet can enter the tunnel that runs to the back of the boat, that way gravity primes the line and it runs under the deck back to the Yamaha outboard.

Does this sound logical?