Question about 1989 Mercedes-Benz 300-Class

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My car continues to stall while going down the road and after sitting a few minutes it will start again. I have replaced the fuel pump, fuel pump relay, fuel filter, plugs, plug wires, altenator, voltage regulator, cap, rotor, and the battery. Do you know what could be causing the car to stall? I have a suspicion the fuel pump relay is faulty. What's your thoughts and how can I test the relay?

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  • Mercedes-Benz Master
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OVP, MAF and have duty cycle set.

OVP's (Over Voltage Protection relay) are known issues in these cars.

Hop on over to benzworld.org to find out alot more.

Posted on Aug 15, 2010

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Posted on Jan 02, 2017

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