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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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