You found the fuel filter, but didn't recognize that the two fuel pumps were sitting right there in plain view.

You can't fix these cars by throwing parts at them.. They are complex, particularly, if you don't have manuals. Actually even with manuals.

You are dealing with a very complicated fuel injection system. You may have looked at the Cap and Rotor, but do you know that sometimes the coil is a problem. Then there is the EHA valve, the idle valve, etc. etc.

I do a fair amount of my own work, but when my '92 300E all of a sudden decided it didn't want to run, I took it to my MB indy. It took him quite a few hours to figure it out. I never would have suceeded.

Steve