If there is something that needs to be reset, you need to figure out how to do this.
I am not familiar with your problem.
I have found Helmut at the Mercedesshop (no relation to this site) pretty good at figuring things out.
He's in North Miami Beach 16058 NE 21st Ave, 305-945-3279.
You might want to join the So. Fla Mercedes Club. Call me at 305 688-0691.
A shop manual probably has the answer to your problem. With any luck, you won't need to plug anything in to reset the computer.
Of course, you could try a squirt of ether in the air cleaner to sort of prime your pump.
It might work and couldn't hurt, just don't smoke around ether.
Semibodacious Transmogrifications a Specialty
1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)
"Time flies like and arrow, yet fruit flies like a banana"