Mercedes Benz repair: 1989 560 sec stalling- Mercedes, fuel pump relay, leak fuel

Question
Sir, Every so often my check engine light comes on very breifly and the car tries to stall when driving or idling. Sometimes it will stall when stopped at traffic light, but will start right back up and be fine for a while then do same later. I just started smelling fuel frm time to time, but notice no leaks. I believe a valve connected to the injection system is at fault, what do you think?
Appreciate any help,
Jeff

Answer
Cold Start Valve is the usual suspect.

Any of these can cause what you describe:

Overload Relay
Fuel Pump Relay
Alternator
Voltage Regulator
Battery "sulfated"
Ignition Coil "breaking down = old age"
KE Control Unit
Reference Sensor
E.H.A. Valve
Idle Control Unit
Idle Control Valve
Oxygen Sensor
Water Temperature Sensor "for computer".
Fuel Accumulator
Fuel Filter "plugged"
Fuel Fitting "LEAK"
Fuel Hose "LEAK"
Fuel Hose Clamp "LEAK"
Fuel Line "LEAK"
Fuel Pump
Fuel Tank Vent Valve "plugged"
Catalytic Converter "plugged"