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Refer to figure.
The diagram shown in annex represents a jet fuel system. The fuel-flow measurement is carried out.
  • A
    after the high pressure pump first stage (item 2).
  • B
    after the high pressure valve (item 4).
  • C
    in the fuel control unit (item 3).
  • D
    after the low pressure valve (item 1).
The main reason why the fuel flow regulator is located after the HP fuel pump and the FCU is because you want to be sure that the pump’s outlet pressure is high enough to supply the fuel spray nozzles for atomization.
  • “After the high-pressure pump 1st stage (item 2)” – INCORRECT. Having the fuel flow at the pump’s inlet is useless.
  • “In the fuel control unit (item 3) – INCORRECT. Again, what is needed is the fuel flow just before the spray nozzles, which will be measured after the passage through the fuel control unit.
  • “After the low-pressure valve (item 1)” – INCORRECT. For the exact same reason listed above, it is irrelevant to measure the fuel flow at the inlet of the HP pump.

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