Part 7f is the copper crush washer and 7h is the o-ring seal.

When the o-ring seal fails, diesel comes out the top of the IP.

The spring wears itself a 'home' position on the copper washer; if you remove the spring you need a new crush washer for the spring to seat properly.

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'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec