At the very least you would need some kind of a vent, when the sun shine hits the tank you will have a lot more than 2-3 PSI.
If you have a fuel pump on the engine, why not utilize a fuel pick up tube inside the tank to draw fuel from the top of the tank.
If you do not have a pump on the engine a diaphragm electric inline pump could be used along with an oil pressure switch and relay to control it.
A pressurized system would need a flawless needle and seat in the carb or you risk pushing all of your gas onto the floor with a updraft or sidedraft carb, a disaster waiting to happen in the case of a fire, bad hose or clamp, filter, fitting etc.
If the engine has a down draft carb in addition to the other risks listed above, you risk washing out your cylinders and filling your oil pan with gas, Not a good thing.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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