Swinging for Divorceā€¦

Before the high $ in tank pumps and tank.
Maybe your fuel is boiling and relocating fuel like or block heat from under carb??
Year round driving in his part of Texas I found vapor lock is a thing fer sher! I shielded the line as it passed the header and added a cool can loaded with small reusable gel packs. Worked especially well for running errands i.e. multiple stops in town >95* in orange car. Aka Nemo