Watch this first, then do as it says, watch the DVD
https://youtu.be/URsMWAxlsqw
and if not the DVD go to the web page and sign on.
https://www.mopar.com/ramtrucks/en-u...rs-manual.html
Do a live chat if needed.
Also consider joining the Promaster forum.
Ram Promaster Forum
Also lots of good info on the Diesel Ram 1500 forum
Ram 1500 Diesel Forum
By the way, this discussion shows you where it is located on the 1500 diesel and what it looks like. Might give you some clues.
Water seperator - Ram 1500 Diesel Forum
I see from the manual, p.90 that you "need to visit the dealer" if the fuel filter needs changing............ what BS. I also see on P.59 and 91 that you, like my Mercedes engine in my View, is restricted to 5% or less Bio Diesel except in an emergency. Do not leave the Bio in the tank, burn it out and refill with regular diesel before storing the vehicle. I pulled into a station the other day and had to go elsewhere because it had a >5 and <20% biodiesel sticker on the pump.
Charles