There are lots of posts targeting the Fuel Pump Relay with these symptoms, but so far it appears to be caused by another component that's temperature sensitive.
Car starts fine quickly, but before reaching full warm-up to ~83C, car dies. I'll attempt a restart & partially turn ignition key, Fuel Pump can be heard running. If I let car sit for a couple minutes, it will start , but stalls after ~ 30 seconds.
I jumpered Terminal 30 to 87 on the FPR Block. Fuel Pump runs, but no start. After car stalls I pulled a Ignition Wire, installed Spark Plug, layed on Valve Cover & tried restarting. Sparks seen across Electrodes, so assume Ignition System not the cause. I have flushed the Fuel Tank, replaced Tank Filter,& Fuel Line Filter. I checked the Warmup Regulator System & Control Pressures & they are fine.
Attached is a wiring diagram related to the FPR, that I found on the internet.
I look at how simple the Fuel Pump wiring is on my 1980 280TE. No need for this big Relay.
Can anyone think of a temperature sensitive item that might be stopping the restart?

Attached Files

1985 Mercedes 280SL Fuel Pump Relay Wiring.pdf (426.7 KB, 32 views)

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80 280TE, 5 speed
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts