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I can't comment on the fuel issue.
If that causes the knocking, your engine is probably toast...
Replacing DMF is probably too complicated if you have to ask, but it depends on your skillset and situation of course. I assume you have access to a lift and a transmission jack?
Regarding diagnosis, use an engine stethoscope and pinpoint the source of the knocking. That is the normal way to start a job like this.
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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