[KTL]

I don't think the heat is great enough to cause the air gap issue with the reference sensor. We've run our Carreras on the track on very hot days and never encountered any hot no-start conditions

When you guys did the rebuild, did you install new reference sensors or reuse the old? I'm just wondering if they are old enough to have some issue with the wiring itself. Try messing with the two black connector wires where they lead out to the actual sensors on the back of the engine?

How old is the fuel pump? They can be pesky with age as well.