Originally Posted by pawoSD

Its an excellent idea that is not quite properly executed. Glow plugs are designed to produce an insane amount of white-hot heat on a very small little spot, an alternative would be to construct something along the lines of a "heatsink" that the glowplug could insert into, which fuel flowed through with a lot of surface area and turbulance, so it heats up well and without a concentrated hotspot like that.

Computer watercooling heatsink blocks come into mind.....except modified so they get real hot with a glowplug, I don't think it'd be all that hard.

I agree your current setup will probably vaporize/coke up the fuel along the way unless you increase the surface area or drastically lower the voltage (at which point it'd probably be useless anyways)