My 89 300SE with the M103 is having an issue. If it sits for a week or so without being started it will do the following on the first startup and run:
Start like a champ from a cold start.
Idle fine while under 40 - 60C.
once it hits between 60 to 80C it will not idle.
Starts to miss and acts like its running out of gas when taking off.
Once it does this when you come to a stop again it will die at idle.
Will not start till it gets cold again. Will crank and crank but not run.
It will fire up fine once its well below 40C.

It has done this to me 3 different times this winter. Each time I made some adjustments thinking it was the duty cycle. After the 2nd or 3rd time running it none of this would happen until it basically snowed and sat unused for a week or so.

Today I ran it again but was more prepared for the stall and did some diagnostics on it. Got it to the stall point and where it would not start and did the following:

Checked for spark. Used my inductive timing light and it would flash while cranking. I also pulled a plug after a while and smelled no gas. Checked the OHMs on the CPS and it was 575 while cold and 825 when hot.

Checked the ohms on the coolant sensor and it read correctly.

Checked for fuel by initially listening for the pump which I can hear then cracking and eventually removing one of the injector lines from the fuel distributor. Saw no fuel come out of the injector line. Next thought was the fuel pump. So I jumpered the relay and made the pump run all the time. No start. Cracked the line before and after the fuel pressure regulator and had fuel dripping/running out.

At this point I was unsure what was going on so I buttoned it up and waited a while. It got well below 40C and started up again with a bit of coaxing and I drove it home.

Thinking the next step is to test fuel pressure but I don't have the setup to do that. The previous owner put a Fuel Pump and a Fuel Distributor on it in about 05. It does have the crappy low idle and takes 2 tries to start on a hot start in the summer. So it does probably need an accumulator. Looks like the PO got the fuel distributor from Germanstar.net.

Since its acting the same as it did previously I am pretty sure it would start to act normally if I got it to run a few times. When it did this to me the first time over a month ago I changed out the OVP and the pump relay with my spares and of course it did nothing. Any ideas on why I would get into a state of no fuel at the injectors for a time after sitting?

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Current
1989 300SE - Siegfried
2010 Toyota Tundra Crewmax
2005 Honda CRV

Gone but not forgotten
2001 F150 Supercrew - The Screw
1966 Ford LTD 390 - The Big G!
1995 Mercury sable
1986 Subaru DL
1982 Ford EXP - my first car