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Water tank fill valve not sealing

I pulled into a campsite and connected the water supply as usual. the water tank was about half full at the time.  After a few days, I noticed a drip coming from the overflow. The fill valve under the lavatory is closed but its leaking by and filling up the water tank and out the overflow. Anyone have this problem? how do you fix it.

Rick
Rick and Wendy Green
1998 U270 3600 The Coach Formerly known as Princess
Build# 5336
2007 Ford Explorer

Re: Water tank fill valve not sealing

Reply #1 –
Rick,

Least expensive fix is to fill tank, turn off water hose and run on fresh water pump.

My fill valve was replaced by cutting pex crimp rings, replace valve and install new pex crimp rings using crimp ring tool.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Water tank fill valve not sealing

Reply #2 –
Another solution:  add a second "fill valve" in the utility bay.  I had a different problem - my back flow valve in the fresh water fill hose line was always leaking.  So I just cut a small piece out of the pex pipe coming from the water hose reel into the coach, and stuck on a SharkBite 1/4 turn valve.  Now when I fill my tank, I have to open both the valve in the utility bay and the one under the bathroom sink...no big deal.

In the photo, you can see the white valve on the bay wall above the hose reel.

Result, my fill hose no longer dribbles water going down the road.  Adding this 2nd valve would also cure your leak.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Water tank fill valve not sealing

Reply #3 –
Quote from: AncloteJoe –
I pulled into a campsite and connected the water supply as usual. the water tank was about half full at the time.  After a few days, I noticed a drip coming from the overflow. The fill valve under the lavatory is closed but its leaking by and filling up the water tank and out the overflow. Anyone have this problem? how do you fix it.

Rick
Rick..
We had the same problem. After searching on the forum, we installed a new valve (under the bath sink floor) using shark bite fittings and problem solved.

Hans

 
Hans & Marjet
1995 U300 "Ben" (#4719)
3176B Cat,4060HD,Jake
SKP#139131
Motorcade#17579
2006 Honda Element (towed)

Re: Water tank fill valve not sealing

Reply #4 –
Thanks all.  I was hoping there was some simple adjustment that could be made but, I guess I'll have to tear into it to fix it. meanwhile, I can turn the water on and when the overflow drips, I know the tank is full so I turn the hose off and run a few days on the pump. 

Rick
Rick and Wendy Green
1998 U270 3600 The Coach Formerly known as Princess
Build# 5336
2007 Ford Explorer

Re: Water tank fill valve not sealing

Reply #5 –
Hang on a sec. I replaced my valve same as Hans&Marjet, however, try this. I have one drain valve in the water pump bay that leaks. EXCEPT if I move the lever just a smidgen off of the closed position  it stops.  It's worth a try. I have not had to replace that valve yet.
1994 U280, Build 4490
Deming, NM.

Re: Water tank fill valve not sealing

Reply #6 –
Waters on, valve is open just a smidgen. we'll know tomorrow. If it works, I'm  happy. if not, I'll work on replacing the valve. Thanks.
Rick
Rick and Wendy Green
1998 U270 3600 The Coach Formerly known as Princess
Build# 5336
2007 Ford Explorer

Re: Water tank fill valve not sealing

Reply #7 –
I dismantled and cleaned the electric fill valve to fix a slow leak, but this will depend on which valve your your motorhome has.
Wyatt
96 U320 40 WTFE, build 4943
84 Toyota Supra towd
2015 Jeep Wrangler towd
Victoria, BC, Canada

Re: Water tank fill valve not sealing

Reply #8 –
Quote from: AncloteJoe –
Waters on, valve is open just a smidgen. we'll know tomorrow. If it works, I'm  happy. if not, I'll work on replacing the valve. Thanks.
Rick
One of the other indicators that the fill valve is leaking is the coaches water pump will cycle to keep the lost pressure up. To test this the outside water supply must be off.
Just another observation.

Hans

Hans & Marjet
1995 U300 "Ben" (#4719)
3176B Cat,4060HD,Jake
SKP#139131
Motorcade#17579
2006 Honda Element (towed)
 

Re: Water tank fill valve not sealing

Reply #9 –
The second photo down this page shows the small clear plastic vertical tube that displays the fresh water level.

http://lazydazers.com/index.cfm?fa=ShowItem&ID=3538

I never add fresh water without watching the the level rise, and then no higher than 2/3 full.

I use the pump t distribute water in the coach.

I also cycle the water valve a few times when starting or stopping the electric valve.

As always... YMMV

best, paul
1999 U320 40' 1200 watts on roof. 12cf AC/DC Cold plate fridge/freezer. VMS 240 CL Honda Element