In Reply to: Vapor lock posted by D Jinkens on July 09, 2019 at 08:05:15:
It's pretty hard to vapor lock a gravity fuel system.
But, they will vacuum lock if the vent is clogged. Remove the cap and see if that helps.
Using ethanol gas? That will cause the same problem. If you are, add a half pint of kerosene to the tank.