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Try flow testing the system through the carb. bowls instead of directly out of the fuel lines. When I replaced the Magnfuel 275 pump with the Magnafuel 300 pump it flowed the same amount with the fuel lines(six pak, three lines) disconnected I called Magnafuel and they said that I was NOT testing the pump correctly, to restrict the flow with the same size as the needles and seat. I hooked up one fuel line and the fuel flow doubled

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So hey Cab ! Do you mean I am going to be pulling the fuel bowls off , holding the floats open and flowing into the bucket while timing to 1 gal. ?

chryco