It would be probably be easier for recognition purposes to refer to your engine in the future as the Cummins ISL.
The primary fuel filter is underneath the engine and is usually accessed by a guy on a creeper from the starboard (passenger) side. One of my projects is to get a Cummins dealer to order the relocation kit to move the filter to the rear (or front if you will) where it is easily accessable (that's the way the 2006 models come.)
The Psssst you hear every so often is informally called the "spitter" and it is just an indication that your ping (air accumulation) tanks are up to the 130 pounds (or whatever) of air pressure. Completely normal (and highly desirable!)
Sorry - don't have a clue about your camera