OK, I'm new to Gas motors and have got a new DL50. In fact, I've not done fuel motors for a long long time as well. Most my stuff is electric. So, I'm looking at some questions here.
1) can all fuel tubing handle both gas as well as fuel? How do you tell the difference. I see you have to use a special stopper in the gas tank.

2) Is it common practice to run the pressure tube off the muffler back to gas tank as you do in fuel planes. If not, do you need to worry about gas leaking out of the vent inlet, does it need a check valve or something?

3) How does it work, the cluncker inside the tank is always to the back of the tank, in a long dive with low gas...how do i make certian that there's no bubbles in the gas line from the clunker being out of the fuel while it went to the front of the tank in the dive. Don't you risk flame out?