I believe the official instructions--which you ought to purchase--will state something like the following:

Detach fuel pressure line at fuel filter.

Intercept the escaping fuel with an absorbent rag.


Probably a good idea to remove fuel tank cap, first.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles