Originally posted by Mattman
Sounds to me like it's getting so hot under the bonnet that the fuel is boiling off which is causing your problems.
I just thought of something while looking through the shop manual. A while back I replaced the fuel pump with a generic model. The new one didn't have the second hose which syphons off the air bubbles in the fuel line. Could that be the problem here? Air bubbles in my fuel which are culminating in some sort of vapor lock in the engine compartment? Maybe some asbestos around the fuel pipes would be a good diagnostic test? Hmmm.....