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replaced #1 piston .... had hole in the center .......... replaced fuel pump and modified lines as previous post suggested .......... it runs great for about 5 -10 minutes then dies .......... will restart with choke on but wont stay running ...... there was a check valve used with the other fuel pump thats run off engine vacuum pulses, does that need to be hooked up with the new setup or not ...... if so, in the return line ??? ran lines past fuel valve straight to pump still have problem ........ tank vent seems ok 
