Been there.

I vote fuel pump or fuel pump relay.

Sneak into the dealership with a heavy blunt object (like the handle end of a big screwdriver, or your tire iron), crawl under the car, and give the fuel pump a firm whack.
If it starts, you need a fuel pump, otherwise suspect relay.

All of this presumes you have spark, but it just smells like fuel to me. Best of luck.

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1986 300E 5-Speed 240k mi.