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It catches metal when the pump comes apart internally to prevent it from going to the injectors

Are you rebuilding your pump ? If the pump is not inoperable or has internal damage, the filter doesn't need to be bothered

Remove the shut off valve from above the fuel solenoid rig up a JIC fitting to some hydraulic fittings that you can add to a can that you can put fuel additive in that can be pressurized with shop air. Remove both return lines and put them into cans with applicable fittings and lines...

Been running these motors for years if the fuel going into the pump is clean the fuel coming out should be as well. Most horror stories of clogged up screens is due to rust from water in the fuel and then the truck sat. Youncould look at a filter in the return side going back into the pump...

The big cam pumps have a filter unit that hooks to the back of the IP. It bolts right on the back of the NHC250 pumps in place of the rear cover you can get a 10 micron filter for that. That is plenty. I run a dual spin head under the cab plus the pump mounted filter 80 micron 20...