[Luce]

The "Vapor lock" is happening as the fuel get's hot, it vaporizes at the pump intake, and EFI pumps can't pump vapor... at least not at 43 psi. Any small restriction to the pump intake can make the pump cavitate, and hot fuel REALLY exacerbates the problem.

I was commending Tommy because it's a series of situations that contribute to the situation rather that a singe component failure. It could be fixed by either not getting in traffic in the heat, removing or reducing the restriction between the pump and fuel, or running the fuel through a coil of tube packed in ice before putting it back in the tank. You could even pressurize the thank with 20 PSI of air to raise the boiling point of the fuel prior to the pump, but that has a boat load of other hazards associated it.

It may be that insulating the fuel lines under the hood is the best solution if all is well now. Or if cosmetics are more important, just stay out of the traffic.