I have made a pressure cooler and I can not tell it will save me runtime but I do believe the tuning of the engine will stay more stable. Heating up the fuel will make the oil in it thinner and so the fuel thinner, that will result in a richer running engine. When tuning it right, after a fuelstop cold fuel will go in and the engine will go lean. The famous hicking engine after a fuelstop.....
Beside that.... the longer pressureline will create less pressure into the engine and you will tune the engine to it so it will be less pressure sensitive and the lower pressure will also create less heat in the fuel.
We have never messered the fuel temperature but we like to know what the differences with and without are.