Technical note

How does air get into a fuel line?

Illustration: technician working on fuel filter-separators and transfer pump connections.
Illustrative image.

Air usually enters on the suction side: loose or cracked fittings, a damaged filter seal, a clogged pre-filter, a low tank level or small leaks. The engine misfires, loses revs or stops; fittings and filter housings should be checked systematically.

Considered together

  • Suction-side fittings
  • Filter housings and seals
  • Pre-filter / separator
  • Tank level and vent

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