Patsy, I read your other post, mentioning that you replaced your hand pump with the newer version. When I change my filters, I discovered that I had a different hand pump than what was listed in the Haynes manual. That book said to turn and unlock the pump knob then pump. Well I kept on turning and turning and wasn't getting anywhere, so I just started pumping. Thanks to your post, I now know I have the newer pump. Mine is also black not white. I mentioned a Haynes manual. I know Haynes does not publish a book for our cars but the book I am using is the one for my father's 123 which has the same running gear, with some minor differences. He has some type of emission box on top of his valve cover, which I don't have.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member