Beleive me, it surprised me as well.

Now, do it again! You might still have a bit of crud still in the system.

I don't know why it accumulates there but it does. I got this tip from a Benz dealership tech who said he tjey often will do this on older cars. The crud prevents enough fuel volume delivery under loads.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)