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I don't know the specs you are looking for. But an alternate and more easily accomplished variant on your idea might be some sort of balloon attached to a long thin plastic or metal tube. You could inflate the balloon inside the tank. If permanently attached to the tube, maybe it is a more easily reversed mod, too. Lots to think about in terms of chemistry and materials. Balls or balloons, you don't want them to break down into small bits or sludge that could get into the pump.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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