I have a 84 300sd. On top of my vacuum control valve at the injection pump I have one of these
which I think is not only faulty but is the wrong one. Shouldnt I have one of these?
My blue and black valve is oriented black side down. Hooked up to a vac gauge it will allow air to pass from blue to black side but not from black to blue side.
If I understand the vacuum system right then this thing is currently preventing intended vacuum from getting to the vacuum control valve and has been installed upside down. Right?

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84 300SD 274K
38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD.

The green one should go between the VCV and the tranny hook up. The green one is supposed to "steady" the pulse of the vacuum to the vacuum modulator on the tranny, IIRC.

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RRGrassi


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Gone and still missed...1982 w123 300D, 1991 w124 300D