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Fuel Shut-Off

Carburetor incorporates an idling speed shut-off (fuel shut-off) valve. Valve is activated by a time delay switch, located in feed line from ignition switch. When ignition switch is turned off, time delay switch interrupts current to idling speed shut-off valve. Valve closes stopping fuel from entering carburetor. After a period of 6-8 seconds, time delay switch reopens idling speed shut-off valve.

Fig 1: MERCEDES-BENZ 220/8 EXHAUST EMISSION SYSTEM
G09309316Courtesy of MERCEDES-BENZ USA