Removal and Installation of the Cummins 6.7L Fuel Filter/Water Separator Mopar P/N 0518341AA
Job Time: 15 minutes
Tools needed:
5/16 Nut driver or Ratchet and socket
1/2" Drive Ratchet with extension for filter removal
or
Strap wrench
pan or jar for Fuel Drain
Motor oil
Got out there today and changed the Fuel filter and here's how I did it.
From the drivers side of the truck remove the (8) 5/16" screws from the fender liner and there's also a clamp attached to the fender liner by the brake fittings that needs to be pushed out and then remove the liner exposing the filter.
Wipe off all the dirt and junk from the filter, disconnect the Water In Fuel
(WIF) connector from the bottom of the filter and then place a drain pan below the drain valve and then open the drain valve two revolutions to drain the fuel from the filter. ( I used a mason jar stolen from the Queen so I could look at the drained fuel) 
Now you have two ways of removing the Fuel Filter. You can either use a 1/2" drive ratchet inserted in the the bottom of the filter (You can't turn the filter the wrong way because the opening for the ratchet will only allow you to remove the filter this way.) or you can use an oil filter or strap wrench as I did.
Make sure when you remove the old filter to remove the drain hose to use on the new filter and you'll also have to reach up into the fuel filter head/Housing assembly and remove the old end seal but it can be thrown away.
Installation
Install the yellow o ring that comes with the Filter and make sure the above end seal is installed.
Lubricate the O-Ring with clean engine oil. (
Do not pre fill the filter with fuel or you'll toast your fuel pump.)
Install the filter until you feel it contact the head and then turn 1/2 rotation more.
Install the WIF connector and drain hose.
Prime the engine.
1. Turn the key to the RUN position but don't try to start the engine for 20 seconds.
2. Crank the engine for 1 to 2 seconds. If the engine does
not start, then release the key or starter button back to the
RUN position (do not turn the key back to the OFF
position). The electric fuel transfer pump will continue to
run and purge air from the system for about 20 seconds.
After 20 seconds, attempt to start the engine again.
3. Repeat the procedure if the engine does not start.
4. Start the engine using the Normal Starting Procedure and check for leaks.
Reinsert the wire clamp into the fender liner and install the fender liner with the (8) 5/16 bolts removed earlier and Congrats you're done.
I took the filter apart and here's what my filter looked like after only 8800 miles. So when the Master Tech I bought lunch for so I could pick his brain told me that the best advice he could give any Cummins owner is to change the fuel filter at least every 10,000 miles he wasn't just blowing smoke and that was the best $10.00 I've spent in a long time.
Note: There's also a secondary filter screen in the top fitting that needs to be cleaned but I couldn't get my camera in to take any pics with the tire on the truck and I was running out of daylight so I'll do a write up next time on that and edit this thread.