Okay, I took off the air cleaner today and found that the bottom of the EHA valve at the back of the fuel distributor is wet. Fluid (gas) matched the smell I detected from the car earlier.

Could it be possible that one of the two rings has sprung a leak? Or do you think the entire EHA is leaking?

Anyone got a non-leaky used one they want to sell me? Its a bit expensive new...

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)