Fuel flow issue
- Thread starter iceman
- Start date
Nope I dont have . Note in the picture the fuel sensor in the line coming from the machanical fuel pump on the front of the engine.
http://picasaweb.google.com/freewillyblue/SavannahProject/photo#5009536736726004002
http://picasaweb.google.com/freewillyblue/SavannahProject/photo#5009536736726004002
Simn_Smith
New Member
Looking at the picture the sensor appears to be mounted the correct way round and in the correct line, however, the wires on the sensor should be pointing straight up (not out at about 60degrees) to enable any air to be purged from the system.
I cannot find the figures at the moment but I know that there is a recommended distance that there should be between the pump and the sensor (12" rings a bell) to damp out any effects from the pump. I would also expect that you might be getting vibration off the engine that is affecting the reading.
Lastly I would recommend protecting those hoses with firesleve.
I cannot find the figures at the moment but I know that there is a recommended distance that there should be between the pump and the sensor (12" rings a bell) to damp out any effects from the pump. I would also expect that you might be getting vibration off the engine that is affecting the reading.
Lastly I would recommend protecting those hoses with firesleve.
- Joined
- Mar 23, 2005
- Messages
- 13,226
The fuel flow sensor only outputs pulses every X thousandths of a gallon, not voltage, so if the flow number reduced, there's only a few options:
1) The flow actually reduced.
2) The perceived flow reduced because of turbulence in the line, and the change in flow changed the way the sensor reacted.
3) You were flowing too high for the sensor and it's in a non-linear region. These sensors are good to 60GPH, so probably not an issue with a rotax.
4) You have a bad connection and the EMS is actually reading noise, and this noise changed when the RPM changed.
We don't have an install manual for the flowscan sensors. They are pretty limited in their info for aircraft installs due to liability.
1) The flow actually reduced.
2) The perceived flow reduced because of turbulence in the line, and the change in flow changed the way the sensor reacted.
3) You were flowing too high for the sensor and it's in a non-linear region. These sensors are good to 60GPH, so probably not an issue with a rotax.
4) You have a bad connection and the EMS is actually reading noise, and this noise changed when the RPM changed.
We don't have an install manual for the flowscan sensors. They are pretty limited in their info for aircraft installs due to liability.
Okay thanks. Copy that. It was suggested to me that I also change the position of the sensor and locate it further from the pump. I will do that tommorrow and give you some feedback in the morning(your time). Thanks again.