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"No start" Caused by Failed Fuel Pump/Relay on Mercedes-Benz 420SEL

Problem Description and Possible Solution

The fuel pump and/or fuel pump relay can fail, causing the car to crank over but not start. Proper diagnoses will be necessary to confirm if the pump or relay is at fault.

Problem Data
RepairPal Verified
Average mileage: 212,000 (199,000–225,000)
2 model years affected: 1990, 1991
4 people reported this problem
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the car started and ran but it would cut out and quit while on the road. I would shake the ignition key and it would start back up. I changed ignition switch (cutting out with dremmel tool). Problem still occured so I changed starter relay and no problem now.