will run for awhile then when shutoff and started again then starts missing replaced fuel lines, lift pump, bypassed fuel pre-heater, checked straws in fuel tank and still persists runs perfect when running but when shut off have to reprime pump to run again any help on this problem please

 

Repce the section of hose to pump with clear hose. Now you can see if air getting in system.

 

ok will try that you just a little getting (pinhole) and just slowly foams fuel?