LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Opel >> 1974 >> 1900 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - EVAP >> Maintenance >> Check & Relief Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Check & Relief Valve

  1. Remove check valve and inspect for leakage by blowing air into the ports in the check valve. When air is applied from the fuel tank side, the check valve is normal if air passes into the check side (crankcase side) but does not leak into the relief side (air filter side).
  2. When air is applied from the check side, the valve is normal if passage of air is restricted. When air is applied from the relief side (air filter side), the valve is normal if air passes into the fuel tank side but does not leak into the check side (crankcase side).
    Fig 1: Opel Fuel Evaporation System
    G09310136Courtesy of NOT AVAILABLE
scientia non olet · About LEMON Manuals