Fuel Flow sensor Install

by Jack Martin in General Tech Discussion 6 years ago

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Re: Fuel Flow sensor Install

by James Ott » 6 years ago

James Ott

22 322 358

That schematic pretty much requires you to mount the FT-60 on the engine, which I think is a bad idea due to vibration and heat. Remember the FT-60 sensor is a small delicate turbine wheel and pick-up. Much better for longevity and accuracy to mount out of the engine compartment in my view. Yes, this will require two sensors, or use one and calibrate it as I described earlier in this thread.

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Re: Fuel Flow sensor Install

by Bill Hertzel » 6 years ago

Bill Hertzel

13 1.95k 7.96k

Placing the Flow sensor AFTER the Return Line and BEFORE The Split to the Carbs will work just fine.

The concern you are reading in the other posts is that they have the fancy Fuel Manifold that incorporates the Return and Split functions in one Block so it is not possible to get in between them and they are not willing to abandon their Fuel Manifold.

If you have just hoses and Tee fittings it will be an easy decision.

Do not mount the Flow Meter directly to the engine.
It is a delicate device and will not tolerate the heavy vibrations.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: Fuel Flow sensor Install

by Alex Legont » 5 years ago

Alex Legont

1 2 0

Bill and all, I have 912 without return fuel line and with only engine driven pump. It appears that the only mounting place for me would be between the engine pump and the carbs. It would place the sensor right on top of the engine with perhaps half an inch space from both the engine and the cowling. Am I right? Will it work or break soon? Should I perhaps give up on it? Any other ideas?

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Re: Fuel Flow sensor Install

by James Ott » 5 years ago

James Ott

22 322 358

I think that is a poor location due to heat and vibration. I put mine under the seat between the header tank and fuel shutoff valve.

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Re: Fuel Flow sensor Install

by Bill Hertzel » 5 years ago

Bill Hertzel

13 1.95k 7.96k

A fuel flow monitor is a novelty gauge in a Rotax installation.
You can see how much fuel is flowing but there is nothing you can do with the information.
There is no mixture control, so the flow will always be the same at any given power setting.

The flow meter should be mounted to the main airframe and well isolated from it at that!
It should Not be mount to, or near, the engine.

The return Fuel line is not an option anymore.
This will require two flow meters.
One to measure the fuel going to the engine and another to measure the fuel returning to the tank.
The Difference between the two is the fuel being used by the engine.
That is a lot of effort for a minimal result.

If you have money in the aircraft budget that is burning a hole in your pocket or you are just looking for something to improve...
I suggest that you install the fuel bypass hose and an Electric Auxillary Fuel pump.
That combination will reduce the chance of an Engine Out due to a fuel vapor lock condition by 99%.
An Effort well spent!

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Capt. Siva,

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Fuel Flow sensor Install

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