I have seen others have good results by isolating fuel system components from heat sources with fiber washers etc, they have had more of a benefit this way than by using a pump controller. Some claim the pump controller makes things worse?
Especially with E10 fuel, and also if you get unlucky and have winter blend in the tank on a hot day, you can still get boiling in the fuel rail at EFI pressures. The only solution is to increase pressure and/or keep the fuel cooler by trying to isolate the rail. The PWM controllers reduce pump output at idle when it isn't needed, which is fine for most situations except when you have high underhood heat. If you could measure fuel temp and increase pressure when the temp is warmer that would be the best of both worlds. Would be cool if the Megasquirt could do that.
