My 1989 mercedes 300e won't start. Not getting any fuel

Problem is in the fuel pump fuse and relay.

I had the same problem, my car would not start after parking it on the street. I followed protocol by checking vital components like spark to the plugs - OK had spark ...next was there fuel to the injectors - not sure because plug should be wet...but where dry. This can be misleading because injectors are mechanical and opens with vacuum from compression. Then I checked the two fuel pumps and one was bad, so I replaced both with a fuel filter also. The fuel relay was fine but I replaced it anyways. Now you would think it would start but no go.
At this point I was confused so I double checked all the connections electrical, fuel and so on. Luckily I stumbled onto a vacuum hose that connects from the IAC valve to the bottom of the fuel distributor that was disconnected. Wow the car started and the car is running fine, or even better. I think my problem was a combination of a bad fuel pump, vacuum leak and neglect. So try checking some of the things I did and maybe it will fix your problem.

Sincerely
Jon