dave

any connection on the entire fuel system has to be suspect including stoppers..........saftey wire all of them ( twice around )...it could even be a clunk that is too long and when doing manuevers it could get caught momentarily out of the fule and into the air in the tank thus draining your uat...sometimes a little here and little there ( ie...you got away with it this time but upon extented manuevers....it would show up ) .... i have even seen clunk lines get old and " trained" stiff and hang if they are too long.i have even seen people use festo check values for filling fuel...works great for 20 lb turbines as they dont pull enough vaccumm....then they use them on a 30 lb turbine and the vacumm pulls the festo open and pewwwwwwwwwww engine flame out

we always use the uat as a fuel system intregrity check....where as when setting max rpm we always look at it and expect it to be full to the top....if not ....its a no go

hornetdriver