Do you have the 4 or 6 clyinder?

1. check all fueses
2. Check all vacuum lines
3. Check fuel pumps-remove them from the car and test them on a spare car battery by taking the 2 leads to the battery terminals
4. check all fuses hoses by fuel pump(s)
5. I would then check all electrical components in the cis-e system by following the procedures on the 201 service disc.
6. Check the wiring harness and make sure you are getting juice from the ecu to the all the devices.

Other things to check are your sensors.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)