Interesting... I'm having this issue again.
I replaced the FP Regulator last year.

It just started happening now that we are at 100 degrees+.

The VX is very sluggish in acceleration. When I get home it smells of strong gas fume odor.

So, yesterday when I got home I decided to loosen the gas cap to see it it's over pressurized for some reason. SURE ENOUGH. It gushed vapors.

Is the EVAP system not working properly? Wouldn't it throw a code if so?