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Home >> Chevrolet >> 1976 >> Chevette Base, Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Evaporative Emissions System >> Testing >> EFE Valve

EFE Valve

  1. Visually inspect valve for obvious cracks or hose disconnects.
  2. Manually apply 8-10 in. Hg vacuum to EFE valve. Actuator link should pull inward. Remove vacuum supply and observe link. It should move outward (valve opening).
  3. Reapply 8 in. Hg vacuum and seal. Diaphragm should hold this level for at least one minute. If not, replace diaphragm or valve components.