Had a problem that after a month of storage, car wouldn't start.
Troubleshot problem to no power to fuel pump. disconnected hot wire to pump and hooked up 12 volts, car started and ran fine. After about 12 hours of looking for the fuel pump relay finally found it. Of course it's labeled as the kickdown relay which didn't help finding it. Finally figured out from a set of 500SEL diagrams the fuel pump and kickdown are shared by the same relay. Anyway, tapped on it and the car started. Either stuck inside or a loose connection. It's marked 80 6376 000 but I can't find anything by that number. Anybody have the correct Mercedes part number. This feels like a problem that will come back..

DR