I too had water pressure problems. I have a device called "Water Bandit". Made by Camco, available on Amazon. I hooked that to the FW intake to the pump, (works like a condom), screwed my winterizing plug into it, turned my air compressor down to 50 pounds, opened my low point drains, and blew whatever was restricting my pressure away. Must have had some trash lodged there somewhere that is now out of my way. That would work on the city FW side too I believe. Necessity is the "mother" of "RV engineering"! You might try it.
2001 Ford F-350 Super Duty CC Dually, 7.3 Diesel
2013 832IKBS Flagstaff Classic Ultra Lite, Hensley Arrow Hitch, Carlisle tires
2016 days camped....211, it ain't over yet!
On the road to ALASKA May 6, home Sept. 13, 2016. 23 states, 3 Canadian Provinces, up to the Arctic Circle, 17,300 miles, 131 days on the road. 1 flat tire, 4 oil changes. What a beautiful trip!