Fuel pump relay failure symptoms: engine stops, hard cranking and high idle RPM KE Jetronic Benz

Fuel pump relays on older 80s and 90s Benzes do much more than just turn the fuel pumps on and off. They can affect engine idle, O2 sensor, climate control, and of course the engine's fuel supply. This video explains what some of the failure symptoms can be when this parts malfunctions.

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