ORIGINAL: nony
Are there any festo fittings or filters between the UAT and the main tank?
When it is running on the ground, can you see any airbubbles traveling in any of the fuel lines?
Any kinks or bends in the fuel lines anywhere?
Is the main tank vent clear??
Half of a UAT is a lot of air... If it were me, and none of these suggestions could not find the leak visually, I would be pulling the entire fuel system out and giving it a very close exam, and likely as not, I'd change all the lines....gives a second chance to make the system perfect and leakproof.
Entire fuel system is out of the aircraft. I'll be inspecting all components this evening or next. No filter or festo is used between the tank and UAT. I'll test the system before I replace the tubing and lines. It is either in the tank pickup tubing/line or the UAT itself is leaking air from a fitting or the fill plug. "I gotta know!" ALL great suggestions! Thank You all for your input. I'll post my findings.
Dave Rigotti