90 560SEL won't start

[garymand]

Tried spark, gas and compression, all good to go. Wife drove the car and says it drove fine the day before, but the next day I get a call at work; You guys will love this, She tells me the battery is dead and she didn't leave anything on.

I get home, opened the car door to pop the hood and noticed the interior light came on about half bright. Put the starter/charger on and on impulse tried to start the car. Motor turns over as normal but no start. I thought very briefly about trying to explain what difference is between dead battery and car won't start, but chickend out. How do you explain to your wife that of course the battery will be dead if you.... it never goes well.

Seriously, pulled a plug and got snap, snap snap, nice. smelled a hint of gas on the plug. Hmm, got a spark and gas, lets check compression: 130lb goodnuf for 130K. But maybe the gas isn't right.

Call me nuts, pulled a pump and checked off the car. good. Put voltage to the pumps and they worked ok. Checked the relay N16/4. (Mine is not where the MB manual says! It is swapped places with N6!) I took N6 to work thinking it was N16/4 and swapped it with a friends 560sel. N6 is good. But I ordered a new one for 60$ mine is original. At home I couldn't find enough pins on the N6 to jump the pumps . Hmm, Lets check N6 Walla! N16/4 pins. Tested the pumps: ~4Amps and >1 liter in under 40 sec. What the heck. now I have a spare N16/4 and the 560 still won't start.

Got gas supply, compression, spark. Now what? another relay? inside the CIS?