jjbardell wrote:Mike,
I'll get you pics of my setup. I believe your issue may be that it's a gold cube. The flow volume and accuracy are for a much higher rated flow rate. The red cube is for lower flow rates. Although the red is stated for fuel injected, it is actually the better suited for our planes.
Red cube - 0-350hp w/ 0.6-70 gph
Gold cube - 350-500+hp w/ 3-125 gph
Someone can prove me wrong, but Matt at MGL and I both agree the gold cube will not be accurate due to the pressure drops and flow requirements. It doesn't even read below 3gph and the transducer turbine cant spin properly to get a reading with our low volume of 1gph (taxi) to 8 gph (40" fully loaded climb).
Also, I recommend filter to be after the red cube, not before. There are two reasons for this I can share if you wish.
Not seeing your layout, you also need to be sure to have the cube at a 2-5 degree downward angle so air doesn't get trapped in it. Your line after you exit the firewall needs to flow downhill all the way to the aero injector.
The cube should follow that path.
Also, make sure it is setup as "turbine" in the mgl setup menu. It's a turbine impeller. Some think it means turbine aircraft. Then set the K factor. I believe it's 18000 for the red cube.
Send me a pm if you want to FT, call or want pics of my setup.
I called the company before and after, and they SWEAR the Gold Cube is the one to use for gravity feed systems, and the Red Cube is for fuel pumps. I didn't believe it either, but they've told me twice, now. They are standing firm to that premise and will not make an exchange.
My fuel system does go downhill all the way to the AeroInjector. I can try putting the fuel filter after the cube. I'll check the "turbine" setting next time I'm at the plane.
I got your PM. I'll send you my email and would be happy to have a look at your setup.