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When fitted to a carburettor, a fuel strainer will be positioned..
  • A
    between the needle valve and the metering jet.
  • B
    between the metering jet and the discharge nozzle.
  • C
    downstream of the discharge nozzle.
  • D
    upstream of the needle valve.
A strainer is designed to be fitted in the fuel systems just before (=upstream) the needle valve (the fuel metering device) to prevent foreign matter from entering and blocking the valve. On simple reciprocating engine aircraft, the fuel strainer is often in the form of a gascolator, that is nothing else than a simple strainer combined with a recipient to collect the unwanted solid particles.

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