I always have trouble uploading photos... but here goes...
These 2 photos show the billet aluminum block we've used to hold a 10 micron primary filter and a 2 micron secondary filter. We had them made for all our trucks. . Even some that are not Cummins engines... .
The primary filter has a water trap built into the filter... We used Donaldson for no other reason than we have an account with them. .
The second photo is of the assembly installed in the truck. . its mounted on the frame rail of the truck...
We started this when we put the 05 3500 dually into service and we now know we can change these filters annually no matter the mileage... Our 08 5500 is seeing 70K or so a year... and testing in front of the filters and behind them just before the change still shows the same fuel pressure... .
Hope this helps. .