I am installing a Wren Mk54 mk4 into a FEJ rafale. Now, this is the first time I have installed a turbine in an airframe. Bench tested the turbine plenty of times and all is good to go. I am using the small tygon to do most of the plumbing. I was told to use 1/8 tygon, but it is too big and does not fit snugly enough over brass tubing from main tank or nipples on FlightWorks fuel pump. I am tying off all lines at connections with wire as well. I am using small tygon from main tank to Tamjets UAT, as well as from UAT to fuel pump. I have encountered 2 problems. Number one is the main fuel line for the turbine is like 3mm festo line. The nipple coming off the pressure side of the fuel pump is for tygon. What I have been doing is using a short piece of tygon connected on the nipple of pressure side of pump and then plugging the 3mm main fuel turbine line into the tygon. I have pushed the festo line as far as I can into the tygon and tried tying it tight with wire. Just does not seem all to secure. Seems like under pressure festo line might blow out of tygon. I would think there is a much better way of doing this, I just do not have the experience to know. I have seen some Hausl pumps that have a festo fitting screwed directly into the pressure side of pump instead of the tygon nipple. This seems like a much better setup. Any suggestions would be appreciated. Problem number 2. Plumbed as such, I ran the turbine in the aircraft for the first time yesterday in the airframe. My Tams UAT is secured to the top of the main tank with velcro straps. I filled the system and was getting some good size air bubbles in my air trap. I tried tapping the tank as it was filling. got rid of most air, but still have a little in UAT. My UAT is also secured pointing very slightly down towards the nipples of tank, not level. When running the engine, any time I moved the aircraft it would create air bubbles which would almost cause turbine to flame out. I could see the air bubbles in the line. When plane was not moving with turbine running, I did not have problems. I removed tanks and checked for leaks using underwater method. Everything seems to be good. Not sure where to go from here. Any suggestions for the newbee would be greatly appreciated. Thanks Jon