Not sure how the Ram fuel system works but on a Duramax the fuel head that the fuel filter screws onto has a bleeder screw and a small hand pump primer . So when I go to do a filter change I open the bleeder screw to relieve the pressure . I remove the filter and screw on a new one . While the bleeder screw is still " open " you start pumping that hand pump primer and it draws fuel into the filter which expels any air . You pump maybe 12 - 15 times until fuel starts coming out the bleeder , when you see fuel you close the bleeder . And your done
. Fire the old girl up , let her idle for a few minutes and your good to go .