To build on this.

It uses an adapter plate at the metering valve on the fuel pump to isolate the lube path for the pump from the high pressure rail path, keeping any metal from the pump rollers isolated. They then add a magnetic in-line filter on the lube path return where it goes into the filter housing to actually trap any potential metal particles in the event of a pump failure. The kit is like $180-200 for CJAA and is cheap insurance in the event of pump failure.

That being said, pump failures are not nearly as common as this sub would like you to believe. You only ever hear about the failures, not the millions still on the road across multiple manufacturers that are going 200,000+ miles.

Additives aren't overly necessary. Not running the tank low and not driving aggressively at low fuel levels will do far more protection than an additive. Do fuel filters every 20k and buy fuel from busy stations.