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Fuel screen is tall and skinny, so junk clogging the bottom doesn't block all flow is my guess, but I bet as the flow goes up it could suck air. Maybe short and fat or just fat would fix it? Maybe a design that squeezes down to fit through the hole and expands inside the tank?
Some hot rod guys run parallel or series pumps, can't say I like series since one failure and flow is blocked.
What do you think of removing or changing the return line regulation and going to electronic full range pressure control of the pump?
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