Update on Vapor Lock and Changes made with Gas Cap/Sig difference in the 2 caps

[Bob A.]

"I still don't believe in vapor lock in a gravity fuel system".

James I agree 100% with you.
Vapor lock is caused in cars with an external fuel pump where as the suction side /line to the pump may be too close to an exhaust pipe or other heat source. This is one reason why modern cars that are capable of running at high temperatures have their pumps placed in the tank where there will be no external suction line and run nice and cool.