[Z-linkCobra]

Where are you getting your fuel pressure from? You say it goes to zero when the problem starts....zero at the regulator? or are you grabbing pressure from a line gauge that feeds the bowls? If its not there already anyway to get pressure at the regulator?

If it is a heat problem...which it sounds like so far you could put in a cool can after the regulator somewhere.

I think Lovehmr might be on to something when he talks about the 14psi pump fighting the regulator. Where is your pump located? If the pump is airating the fuel simply by force then when it gets to the motor compartment it will expand that much easier.

Maybe a small(like 1/4") return line off the outlet of the pump right back into the tank...take the back pressure off the pump.

Just thinking outloud.

Gene