you know the first time around that filter nut was about the tightest piece of plastic I've even had to loosen that wasn't glued together. I used a long 1/2 drive wobble extension and a socket and a breaker bar to reach down from above .This tool made changing the front filter (removing the plastic cap) much easier.
why Cummins can't put the spin on fuel filters like they use on all the other Cummins ISB engines is beyond me.