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I've been considering putting together a tank level indicator by making up a plastic manifold using push-in fittings and plastic valves. One valve goes to fuel, one to holding, one to water. A port on the manifold goes to a fuel bulb from an outboard. A final port goes to a clear u-tube with water attached to a bulkhead with an adhesive scale next to it. You open the valve for the tank you want to read and squeeze the bulb until the water stops rising in the u-tube because it is bubbling out in the tank you are reading. The difference in the two water levels is the depth of liquid in the tank.
I started using this kind of manometer to measure differential pressure for air flow measurement because we kept losing the damn Helicoid gauges due to corrosion from water vapor. The u-tube manometer is bulletproof.
Gary H. Lucas
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