Originally Posted by hammerz3
Thanks for the quick reply. My fifth wheel does not have a gravity fill. The garden hose connects to I guess you could call it a utility panel from which a series of valves direct it to where it needs to go. I've taken the back panel off to inspect what is back there, all the valves appear to be connected with 3/8 tubing which must constrict the flow causing the slowdown.
I finally took the plunge and removed the fresh water drain valve, installed 90 degree elbow and about 9 ft. potable water hose so it reaches other side of trailer, fabricated a bracket and installed a hose bib. I now use this valve to directly fill water tank, it has cut the fill time from about 40 minutes to about 17 minutes