Originally Posted by Cat 1

Many fuel setups in aviation are "pressurized" but never for engine supply directly - They usually use forward airspeed to generate some sort of head pressure on the tanks just to make sure fuel "moves" properly and in some cases (with bladder style tanks) it prevents collapse of the tanks. Cant remember the set pressure (1.5 to 2 psi I think) but the popular "king air" aircraft I have worked on, have a intricate little vent system that has a couple of "heated" tank vents that are angled into airflow and on the bottom of the wing .

Most RC tanks get pressurized but its only .5 psi - Some (YS engines) get pressurized much more. A small fuel pump would be doable (RC turbine) but I think control of pressure/flow would be an issue. It works in the turbine as its the "driver" and everthing else happens because of the amount of fuel applied - with an IC engine - it must follow a number of other drivers.