Hi Jim and all interested,

I sure feels good to get rid of the air bubbles after trying just about everything I could think of...the header tank did the trick!!!

Nevertheless in my first post I mentioned that along with the air bubbles, as soon as I moved the plane from the horizontal position on the stand and tilted the nose up, it also quickly leaned out & died.

Well this problem was still occurring to a lesser degree but bad enough to say - You can'y fly just yet!!!
Still needs fixing.

I still had the Iron Bay Fuel Regulator in the fuselage behind the firewall approx. 6"~ 7" behind the Super Tiger 90 carburetor.

After some time looking at the problem & thinking about the mechanics of the fuel regulated system,
I came to this conclusion:

The regulator stops the flow of fuel until the carb demands some.
The carb applies suction that pulls on the regulators diaphragm opening it.
Fuel then flows through supplying the carb with just the right amount it needs.
What I didn't initially realize, was that the fuel between the regulator and the carb nipple isn't pressurized.
Remember that the regulator only supplies what the carb asks for, so it's not been force fed (like a perry pump).


Now when the plane is horizontal and wot applied........engines runs great.
Tilt the nose up...not sooo good. why??
I began thinking just maybe the long fuel line from the regulator to carb was having gravity working against it!!??!!
So I relocated the Iron Bay Fuel Regulator to a closer position just behind the carb.
BINGO....Problem Solved.
Once you have the Hi-speed & Idle carb needles set just right, any attitude is now a non issue!!

Photos 10, 11 & 12 below shows my SuperTiger G.90 converted to run on gas with CH ignition & repositioned Iron Bay Fuel Regulator near carb.

Had 2 flights earlier this afternoon between rain showers...engine now works like a GEM!!!

Cheers.

DDriver.