Diesel leak

Nice relocation! I missed out that this was an old thread.

Have seen severe rust on the rear axle and front wishbones for a few A2s, so was just curios considering the photos of the dieselfilter
 
I'm confused. :oops:
Help me figure it out. It seems to me that the scheme is not correct ....

Is a blue hose or a black hose put on a red filter inlet?

Handset number 6 is designated as - return line! So the fuel radiator should be after the filter and the diagram is not displayed correctly? At the input of the filter should tube number 4 ?
 
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