Fuel flow meter?

[Kitfox Pilot]

What did you guys put on your rotax fuel lines to read fuel flow and pressure displayed on the EFIS?
And where did you mount it?
Thanks Harlan

[alexM]

I've got the same question. In the case where you have a return line to the header tank it seems like you need two fuel flow sensors.

I'm hoping someone has the answer and can type real slow so I can understand.

[Shadowrider]

Red cubes ft60, 2 of them. Stein or spruce sells them. Put One beforethe start of the fuel rail and one at the end. Efis then does the math to tell you fuel flow. Then you program how big your tank is and now you have a fuel gauge(counter) of fuel remaining. You do have to calibrate it. I have mine accurate to .2 gallons but takes a while to get it dialed.

[Kitfox Pilot]

Red cubes ft60, 2 of them. Stein or spruce sells them. Put One beforethe start of the fuel rail and one at the end. Efis then does the math to tell you fuel flow. Then you program how big your tank is and now you have a fuel gauge(counter) of fuel remaining. You do have to calibrate it. I have mine accurate to .2 gallons but takes a while to get it dialed.


Do you have these on the engine side of the fire wall between the fuel pumps and the engine, then on the return line? Or inside on suction and return lines?
Thanks

[Shadowrider]

Engine side is where I put mine. I suppose you could put them on the feed and return of the header tank? They have some pretty detailed requirements like how close to a pump they can be and how close to a fitting or a bend so to get accurate readings. They are basically a wheel or small paddle that spins from the fuel flow so if there is abnormal flow or any cavitation it messes them up. Just look up the manual online and check installation instructions. On mine I put them engine side, first one goes after the fuel pump and before the fuel rail and then on the return line after the fuel rail and before the firewall. Basically they measure how much fuel is going to the engine, and how much fuel is returning and then subtract one from the other to tell how much fuel your engine is burning.

[efwd]

Hey Harlan. If your 915iS is anything like the 912iS, you will only require a fuel pressure sender. Your big $$$ you spent on your engine should have the EMU reporting all the Consumption and remaining fuel numbers. The only thing the 912iS didn't come with is the pressure sensor. I bought the "red cube" as well, didn't realize it wasn't required, but it's still sitting in my garage.
My fuel pressure sensor is mounted on the fuel manifold on the engine side of the firewall.

[Shadowrider]

Good point Eddie! My description is for how to get fuel flow on a 912. I think I read the 915 you can connect the canbus and read data coming from the ecu?

[Kitfox Pilot]

Hey Harlan. If your 915iS is anything like the 912iS, you will only require a fuel pressure sender. Your big $$$ you spent on your engine should have the EMU reporting all the Consumption and remaining fuel numbers. The only thing the 912iS didn't come with is the pressure sensor. I bought the "red cube" as well, didn't realize it wasn't required, but it's still sitting in my garage.
My fuel pressure sensor is mounted on the fuel manifold on the engine side of the firewall.


Well thanks for the info Eddie, I have the fuel pressure sensor same place that you have but I didn't know I'd already bought the rest of the information I needed in the box!