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Home >> Mercedes Benz >> 1978 >> 450SL >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - EVAP >> Testing >> Float Chamber Vent Valve >> Carbureted Models

Carbureted Models

  1. With ignition switch on, disconnect, then reconnect wire connector on solenoid. If solenoid is operating correctly, an audible click will be heard.
  2. Remove center hose from charcoal canister and hold finger over hose opening. With engine at idle, no vacuum should be felt. Increase engine speed slowly to 2000 RPM. Vacuum should increase with engine speed.
    Fig 1: Float Chamber Vent Valve (Ignition On)
    G09310087Courtesy of MERCEDES-BENZ USA
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