I have a 150 8KCAB. In the summer months on a hot start, the emergency fuel pump won't pick up fuel to prime. I replace the pump with a new one and problem is still there. Sure hope somebody can help, I'm going crazy!! LOL
You are getting vapor lock. Avgas will vaporlock, too. Insulate your fuel line fwd of the fire wall with 'firesleeve.' Vent your engine while parked-should help.