[Tillik]

I had ton of fuel flow issues last summer. Usually the fuel would empty out of my line from my pump to the carb. It was most noticeable after the truck sat for a while. I changed the filter, all the lines from the carb to the tank. Drove me nuts. Finally changed the mechanical fuel pump. Seemed to cure my problem. There must be a valve in the fuel pump that maintains positive fuel pressure to the carb and mine must have been broken. Good luck with your issue.