Here's a short tip about the UAT.
Make darned sure that the UAT filler line doesn't leak any air at the fitting or the plug. If it does, the engine will drain the UAT , then flame out. No fuel will be used from the mains or header.
The UAT must remain totally sealed in order to draw fuel because it is on the SUCTION side of the fuel system.
Some years ago, I witnessed a flameout that occured while taxiing to the runway for takeoff. The owner had inserted an allen capscrew into the UAT filler line. When I asked him where the plug went, he said he left it on the workbench at home. Air was leaking past the threads of the bolt, and the engine simply drained the UAT.
Didn't matter. After he sealed the line with a loaner plug and took off, the stab blew off and the airplane, engine, and radio were totally destroyed in the fiery crash.


Harley Condra
BVM REP
JetCat REP