Dream to fly Posted July 25, 2019 Report Share Posted July 25, 2019 Have a EDM 900 and fuel flow was bouncing around. Several times it went to zero all the while the engine was running fine at 2450rpm and fuel pressure was 22psi. Any ideas as to what causes that? Sent from my E6910 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Yetti Posted July 25, 2019 Report Share Posted July 25, 2019 Remove and clean with carb cleaner. The blue stuff gums the wheel Quote Link to comment Share on other sites More sharing options...
PT20J Posted July 25, 2019 Report Share Posted July 25, 2019 Check all the wiring for loose connections. There are three wires to the transducer: power, ground and signal which should be shielded with the shield only grounded at the EDM 900. You can try soaking the transducer in Hoppes #9. It helped mine for a few hours but ultimately I ended up replacing the transducer. Skip Quote Link to comment Share on other sites More sharing options...
carusoam Posted July 26, 2019 Report Share Posted July 26, 2019 We see a couple failures of the sensor around here... 1) Leaks from loose fittings... in one case fuel leaks out... another case air leaks in... 2) depending on where the sensor is located... some are in crappy hot locations near exhaust pipes.... 3) Some Have other install issues like sharp bends close to the sensor.... 4) The sensor itself is a paddle wheel in the fuel flow with a magnetic sensor sending signals to the JPI, that is counting how many rotations have occurred over time... Inspecting for damaged wires makes a lot of sense... inspecting for any blue staining under the cowl is important... cleaning the LL out of the sensor can be very helpful as the wheel may be sticking on the deposits that can occur.... PP thoughts only, not a mechanic... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Dream to fly Posted July 26, 2019 Author Report Share Posted July 26, 2019 We see a couple failures of the sensor around here... 1) Leaks from loose fittings... in one case fuel leaks out... another case air leaks in... 2) depending on where the sensor is located... some are in crappy hot locations near exhaust pipes.... 3) Some Have other install issues like sharp bends close to the sensor.... 4) The sensor itself is a paddle wheel in the fuel flow with a magnetic sensor sending signals to the JPI, that is counting how many rotations have occurred over time... Inspecting for damaged wires makes a lot of sense... inspecting for any blue staining under the cowl is important... cleaning the LL out of the sensor can be very helpful as the wheel may be sticking on the deposits that can occur.... PP thoughts only, not a mechanic... Best regards, -a- I'm going to check on it Sunday. They way it's acting I think the wheel is sticking. Sent from my E6910 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
gsxrpilot Posted July 26, 2019 Report Share Posted July 26, 2019 I was told that using a gun cleaner works well. Mine was doing the same thing over the last month or so... I took it to Arapahoe Aero. They took a look and just ordered me a new transducer from JPI. About $300. Quote Link to comment Share on other sites More sharing options...
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