W210 /220 CDI/ "Bleeding valve" on low pressure fuel line.

W210206

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Your Mercedes
W2102061B ( 220 CDI MY2000)/ 611.961
Hello.
The engine is a 611.961/ MY 2000
This valve have part# 6110780349 and it's located on the top of the engine, merged on the fuel line that going from the output port of the low pressure pump and ends at the intake on the shut off valve.

IMG_5944.jpg

The white part/ piston of the valve has its own part#6110780331 and is named: FITTING (BLEEDER VALVE).
Do this mean that I can bleed the low pressure fuel lines and get air out of the system at this valve?
If yes, how do I operate the valve?
Push, pull or twist? (The one on the picture is hard to move in any direction.)
 


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