Tappet Mystery HPFP's Diagnostic Conundrum

The tapping noise attributable to the high pressure fuel pump, located on the top back of the engine on the passenger side. So I pulled the high pressure fuel pump and as I removed it I made sure the roller follower didn't fall out... I pulled it out and then ... Took me about 2 hours and lots of spilled fuel to get those suckers all out and the injectors pulled out. ... behind me after I was 3/4 of the way ... Follow eSI procedure under "Engine | Engine Mechanical - 2.0L | Repair Instructions - On Vehicle | Intake Camshaft and Valve Lifter Replacement ... ... high pressure fuel pump. As a result, the friction between the fuel pump parts will cause them to wear out even faster to the point of failing. The WSM basically just says to replace damaged components as necessary. I see no reason why you could not replace the fuel pump tappet and be on your merry way, ... The shop manual indicates this may happen to the HPFP when reattaching the pump. The directions are to insure the flat part of the cam lobe is at the top. Remove the high pressure fuel pump roller lifter. ... The plunger can easily be pulled out of the bore hole to inspect it for wear. On my 2018 the bolts that hold the HPFP down have sheared off TWICE now. First time was about 200 miles ago, and about 2k after the cam phaser ... Here is a proper way of replacing BMW 335i E90 E92 E93 High pressure Fuel pump replacement. A step by step guide to a HPFP N54 engine ...