
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


