"I had the key out of the ignition and heard a noise like the fuel pump in the tank coming on for a few seconds and then off."

thanks I wish it were that simple, but this is with the key off and not in the ignition, happens every 15 minutes or so.

I think I would notice the antenna going up and down.

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82 300TD - 130k
68 280SL - 135k
91 300TE - (sold)
87 300 TD (sold)
89- 300E - Parts beast (sold)
90- 300E 2.6 (daughter's)

plus a couple of Toyotas and a Volvo