rv8bldr
Well Known Member
Hey everyone
I'm having an issue with my fuel flow indications. I originally installed a Floscan fuel flow sensor along with an RMI uMonitor in my IO-360-A3B6D powered RV-8 12 years ago. A couple of years ago, I upgraded to the MGL xTremeEMS and just kept the fuel flow sensor. It worked just fine up until a week or so ago.
At that time, I replaced my panel because I moved some stuff around. Since then my fuel flow is random...ish. It shows 0 L/hr (I have it set to liters) at idle, then sometimes between 7 (about 2 g/h) and 15 ish (about 4 g/h) at run up. I get in the air and it varies between 20 (about 5 g/h) and 105 (!! about 28 g/h - not possible with an IO-360).
I thought it might be a bad ground, but have confirmed those are good. The fuel flow requires a 5.6K resistor on the RDAC unit and that checks out fine. The confusing part is that all sensors go into the RDAC unit on the firewall, and then the data is sent via RS-232 to the display. All other indications are good, so I'm left with the conclusion that the fuel flow sensor itself has failed. Could one of the failure modes be varying flow indications? It isn't like the numbers jump randomly; they smoothly go up and down, and sometimes just go to zero and stay there.
Any insights would be appreciated.
I'm having an issue with my fuel flow indications. I originally installed a Floscan fuel flow sensor along with an RMI uMonitor in my IO-360-A3B6D powered RV-8 12 years ago. A couple of years ago, I upgraded to the MGL xTremeEMS and just kept the fuel flow sensor. It worked just fine up until a week or so ago.
At that time, I replaced my panel because I moved some stuff around. Since then my fuel flow is random...ish. It shows 0 L/hr (I have it set to liters) at idle, then sometimes between 7 (about 2 g/h) and 15 ish (about 4 g/h) at run up. I get in the air and it varies between 20 (about 5 g/h) and 105 (!! about 28 g/h - not possible with an IO-360).
I thought it might be a bad ground, but have confirmed those are good. The fuel flow requires a 5.6K resistor on the RDAC unit and that checks out fine. The confusing part is that all sensors go into the RDAC unit on the firewall, and then the data is sent via RS-232 to the display. All other indications are good, so I'm left with the conclusion that the fuel flow sensor itself has failed. Could one of the failure modes be varying flow indications? It isn't like the numbers jump randomly; they smoothly go up and down, and sometimes just go to zero and stay there.
Any insights would be appreciated.