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What about using something like this as part of the system? You would rig this funnel over the gas tank and then run a hose from underneath the tank, through a 12V pump, up to the funnel. Would that work? You could even pour in some solvents to dissolve crud.
https://www.amazon.com/Hopkins-F1NC-...dp/B00N4UN1RM/
Or I guess another way to do it would be to position the funnel under the tank outlet in the cabin, going into a gas can, and then you run the hose from the can up to the top of the tank via the pump. That way the pump is always flowing clean gas.