Today it won't fire at all.
Borrowed a better code reader from FLAPS, it knew there had been an evaporative emissions event since last reset, my Scangauge didn't mention that.

In scrolling through all the available readings, the only thing that caught my attention was MAP = 0.0 " hg, no matter whether it was cranking or just sitting.

I tried unplugging the MAP, and then the MAF, still won't fire.

I hit the schrader valve in the fuel rail, no fuel.

How do I jump the fuel pump relay to make sure I'm getting power to the pump?

Where is the pump?

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'79 300SD W116
'86 190E 2.3-16V W201
'92 300D 2.5 W124
'99 E320 4MATIC S210