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Q: Why does my car won't start after I changed the Fuel filter & fuel pump? on 1993 Mercedes-Benz 300SE

After I replaced the parts My car still won't start.
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Well, what made you think those parts would fix your problem? What have you done to diagnose your car?
does the fuel pump has it's own computer that sends data to it? If so could that cause it not to start?
I think your mechanic is not knowledgeable enough to do the job.

There is a fuel pumps relay, I would check that. There is also fuse 13, a 30 amp fuse I would check. The relay gets it's power and ground from a LH Control Unit. If no power and ground to the relay, and the all wires are good, I would suspect the LH Control Unit. Do not use a test light to check for power and ground from the LH Control Unit, use of a test light may damage it. Use a High impedance DVOM.
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