I have the same boat, but with two good aluminum side tanks, 20 gallons. I removed both, cleaned them out, and then replaced all the fuel line and added a big filter with replaceable cartridge like a car oil filter. I replaced the selector valve too. While the tanks were out I replace the electric level senders and added wires from those to the dashboard, where I will add a gauge and selector switch.
So my boat still has two BIG storage spaces over a foot deep under the middle of the walking deck between the seats. I have a place for the anchor and 200 feet of rope, and other bulky things. I have a place for tools, and extra life jackets, etc. I would hate to give up all that valuable storage for a gas tank. I suggest installing two side tanks as originally designed. Its easy to balance the weight by using some from each tank.
Larry
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1975 Wellcraft V20 Steplift with 1979 Evinrude 150. Newly rebuilt dual axle trailer. Boat is in a slip behind Harbor Island on San Diego Harbor.
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