thank you for your response gerryndennis. Now I understand better a few things related with the uniflow and CLine fliers. I cannot move neither the tank nor the engine. This is a phoenix PC-9 (very well know in your neighborhood, I guess) as the cowl sets the engine location and the nose gear sets the tank location. No doubt that the plane was designed for electric, although they indicate that you can run a glow engine. Anyhow, in regards with the two check valves, I guessed I would need them anyhow, so I ordered them yesterday. I saw a diagram on the installation of the check valves here:
http://www.rcuniverse.com/forum/glow...ml#post9045226
Is this the installation are you suggesting? because I am not too sure about it.
About the pump/regulator, I was giving it a serious look, but I did not like the idea of tapping a pressure fitting in the crankcase. But if bad goes to worse, I think I will not have another choice than going that direction.