Rudeboy

Yeah I know, but the 10cc, 15cc and 20cc engines don't have a Walbro type carb.
They have a "normal" twin needle carb (like a glow engine), but with a built-in pressure regulator, fed by a pressurised tank.

Now, on the Evolution and Horizon websites it is stated that these engines have a "crankcase pressure type carb"...which would be great, because you could mount the tank over the CG (crankcase pressure is rather high, and thus capable of feeding fuel a long way).

But apparently this is not the case, and they run on muffler pressure, which requires the tank being behind the firewall.
I would really like to know if the regulator could cope with case pressure...that would make life simpler. I guess I'll have to guinea-pig a crankcase-pressure setup, and see how it turns out.