My guess is no,
My guess is that there may be a check valve not working.
I don't have a check valve but on my fresh water fill circuit there is a check valve that prevents the water from coming out the connection point when not hooked up. I had to replace mine, I did use a garden hose type shutoff valve until I could find time the fix it.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi