HELLO BILL, HAVE A G90 IN A UCANDO AT OUR FIELD THAT IS BEING STUBBORN. THE TANK IS MOUNTED HIGH IN THE FUSE WHICH CREATES A SIPHON AFTER PRIME. ONLY AN ISSUE WITH RELIABLE IDEL HERE. THE OWNER IS NOT WILLING TO MAKE MODS TO THE AIRFRAME
(MAYBE NOT CAPABLE EITHER), SO I WAS WONDERING IF YOU HAD ANY SUGGESTIONS?

If a too-high fuel tank position is causing problems with idle and midrange, there's not a lot that can be done without moving the tank, moving the engine, or going to a regulated fuel system. Sorry, but that's something with no easy answer.