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Checking the tank strainer and changing the rubber fuel lines both sounded reasonable.
You said you changed the fuel filter but you did not mention cleaning the strainer in the strainer/heater before the mechanical lift pump (This is also a notorious place for an air leak). A fuel pressure gauge might tell you something.
Have you done an autopsy on any of the filters you changed to see if they were gunked?
You said you changed the fuel filter but you did not mention cleaning the strainer in the strainer/heater before the mechanical lift pump (This is also a notorious place for an air leak). A fuel pressure gauge might tell you something.
Have you done an autopsy on any of the filters you changed to see if they were gunked?