How is fuel metered in continuous flow fuel injection system?

  • $\begingroup$ Both questions. $\endgroup$
    – Myat Khant
    Oct 26, 2017 at 2:49

1 Answer 1


Just in front of the engine. It makes most sense to measure fuel flow as close to the engine as possible: any leaks between meter and engine will distort the measurement. Here is an example of the B737 arrangement.

From own work based on on-line presentations

As to the how, airborne fuel flow meters work in the same way that turbines do: the mass flow of the fuel causes an impeller to spin, rotational speed is then a measure of fuel flow. Note that it is a measure of fuel mass flow, not fuel volume flow: mass flow is not subject to variations due to temperature etc.


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