$13 will get you a replacement diaphragm from Mac's, or for around $90 you can get a brand new mechanical pump from your local NAPA (part number 571)which will have both ethanol resistant diaphragms and check valves.
Personally I am running the mechanical pump on my own carrier as well as the ones form work. I run a filter just before the fuel pump as any sediment getting to the pump will dislodge the check valves and cause the pump to merely idle.
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