Shore water psi loss.

Topic: Shore water psi loss. (Read 1491 times) previous topic - next topic

Shore water psi loss.

June 21, 2018, 07:36:09 pm

It never ends, does it? Started losing pressure after 5 minutes, down to a trickle. Thought it was the Park water, tested it, fine. O.K., the water softener? Bypassed it, same. Could not fill the holding tank, take showers or even do dishes! After screwing around all morning, I walked around to the wet bay and THERE WAS WATER ALL OVER! Went to the dark side, looked underneath. No drips.I 'd had a bad leak in the HWH a while ago, so checked that, nada. I happened to walk up forward and noticed the neighbor had a drip irrigation system that had a leak, and the water was flowing to where I thought I had a leak in the coach. Opened a cold one and wondered "what the hell is happening?" Searched under the sink again, noticed a Pentair 'whole coach' water filter system blocked by our pots and pans that I assume was OEM, but had no paperwork about the service of it. Did some checking online, ordered a fresh filter, YES!!!!!! Back in business after screwing the day away. The filter needs to be changed every year, or more often depending on usage. Now I know.............

Re: Shore water psi loss.

Reply #1 – June 21, 2018, 08:11:53 pm

I suspect the check valve at the coach water inlet connection is stuck or broken.

Re: Shore water psi loss.

Reply #2 – June 21, 2018, 08:28:03 pm

Doesn't that filter just go to the small drinking water faucet to the left of the big faucet?

Re: Shore water psi loss.

Reply #3 – June 21, 2018, 08:46:03 pm

Quote from: folivier – June 21, 2018, 08:28:03 pm

Doesn't that filter just go to the small drinking water faucet to the left of the big faucet?

No. The Pentair (from what I can figure since crawling around under the sink is a pain) filters the on-board, the holding tank, and the small faucet. Since nothing is labeled and no schematics exist, I'm not sure about the small faucet, which, I always thought was the only part of the potable that WAS filtered!

Re: Shore water psi loss.

Reply #4 – June 21, 2018, 08:48:25 pm

Mike,

Did the new Pentair filter fix your water problem? My only experience with the Pentair filters is that they are not used for whole coach filtration, only the drinking water at sink. Mine looks just like yours. They are restrictive low flow filters. Can't handle any volume use. The black handle on top of Pentair is a shutoff valve for changing filters. If your plumbing is as you describe, perhaps your Pentair valve was bumped by a pot or pan under the sink?

I agree with Bill Willett, the check valve at water inlet is a possibility. I recall reading another Forum thread where same issue, low water pressure, turned out to be busted check valve. That or mineral buildup in the plumbing. Do you have additional water filters between coach and the park water supply spigot at your site?

Look forward to hearing that the problem you have is fixed and how.

Re: Shore water psi loss.

Reply #5 – June 21, 2018, 08:52:39 pm

Sounds like check valve stuck.

Re: Shore water psi loss.

Reply #6 – June 21, 2018, 08:55:15 pm

That filter is OE-- well it's placement is anyway. No idea when it was last changed. My last records (which you should have: Change ADC filter 2/2/12). It goes to just the small separate spigot to the left of the sink and to the ice maker.

I would start by removing the screen in the kitchen faucet and checking for mineral deposits.

Re: Shore water psi loss.

Reply #7 – June 22, 2018, 10:19:52 am

I may not be explaining the problem well enough: at 5 min. the pressure in THE WHOLE COACH drops to a dribble. After a 10.00 min. shut-down, the pressure comes back up, but not for long. The drop affects the kitchen (with new faucet), the shower, head + no pressure to fill the holding tanks! I'm going to throw the filter in today. Pentair says a psi drop is sure sign of time for a fresh canister, so I'll see. Anything else that could be causing this?

Add-on: we can get pressure through out the coach (can take showers, etc.) when we pump from the on board potable.

Re: Shore water psi loss.

Reply #8 – June 22, 2018, 10:52:46 am

There in no filter in the holder under the sink on our coach and we have no water issues. Haven't tried the spigot though. I assume the filter mike showed above is the one I need? OCD tells me I need one

Re: Shore water psi loss.

Reply #9 – June 22, 2018, 11:04:22 am

The Everpure filter under the sink supplies the drinking water tap at the sink and a line runs across the kitchen to the refrigerator/icemaker on our coach. It does not supply the house plumbing (sinks, shower, fresh tank etc). It does make a big difference in the taste of the water & ice cubes though. I'd recommend adding the filter if you use the drinking water or icemaker, otherwise it does nothing for you.

Re: Shore water psi loss.

Reply #10 – June 22, 2018, 11:07:03 am

Yes, check for restrictions between shore water faucet and coach.

That includes any external filter or pressure reducer as well as the fill/shore water valve.

Re: Shore water psi loss.

Reply #11 – June 22, 2018, 01:00:13 pm

Quote from: wolfe10 – June 22, 2018, 11:07:03 am

Yes, check for restrictions between shore water faucet and coach. That includes any external filter or pressure reducer as well as the fill/shore water valve.

Checked from shore water to wet bay, all fine. Nothing external. I did not know I had a "fill/shore water valve". Any idea where that is? It does NOT explain why I get good pressure for 5 min., then, drip, drip. Is there some sort of anti syphon plastic unit behind the hose fitting in the wet bay?

Re: Shore water psi loss.

Reply #12 – June 22, 2018, 01:04:03 pm

Quote from: mike leary – June 22, 2018, 01:00:13 pm

Is there some sort of anti syphon plastic unit behind the hose fitting in the wet bay?

Yes, built into the receptacle that you screw the hose into is a check valve/anti-siphon valve and does warrant checking.

And, you are correct, on the 1993 U240 the fill valve is up forward in the "flip up" compartment between the front seats and would not be causing your shore power restriction.

Re: Shore water psi loss.

Reply #13 – June 22, 2018, 01:28:55 pm

Quote from: wolfe10 – June 22, 2018, 01:04:03 pm

Yes, built into the receptacle that you screw the hose into is a check valve/anti-siphon valve and does warrant checking.

Can I just remove the anti- siphon valve and still run water? The chances of finding a fresh one here are dicey, and YOU KNOW the DW will not be pleased if we have NO WATER!

Re: Shore water psi loss.

Reply #14 – June 22, 2018, 01:47:49 pm

Quote from: mike leary – June 22, 2018, 01:28:55 pm

Can I just remove the anti- siphon valve and still run water?

The internals (check valve, spring, and cage) can be removed. Whether you can do it will depend on what tools you have handy and your skill set.

Mike

Re: Shore water psi loss.

Reply #15 – June 22, 2018, 01:49:01 pm

Can you fill the tank for now and use your pump?

Re: Shore water psi loss.

Reply #16 – June 22, 2018, 01:56:15 pm

Quote from: craneman – June 22, 2018, 01:49:01 pm

Can you fill the tank for now and use your pump?

No, I tried. The water pressure drops so fast, It would take me a case of beer to open the ball valve at the tank, fill for 4 min,, drink, let it recharge, fill, recharge, drink. ALL DAY LONG! Wait a minute, that sound like a great idea. News when I sober up!

Re: Shore water psi loss.

Reply #17 – June 22, 2018, 02:22:14 pm

Here's a pic of the valve lines for the on board water tank. Left is incoming, right is drain. I read the condition on my 'Tote Vision' screen.

Re: Shore water psi loss.

Reply #18 – June 22, 2018, 03:32:40 pm

As long as your pre-coach filter is not a problem (i.e. if you remove the hose connection at the side of the coach water flow is good), then the anti-siphon/check valve is the next likely suspect.

They are available anyplace that sells RV parts.

Look here for replacements and or temporarily removing the guts:

rv water fill check valve - Google Search

Re: Shore water psi loss.

Reply #19 – June 22, 2018, 04:35:47 pm

Had same issue of low pressure and volume on my coach. Changed the check valve/anti siphon valve (even though there was no sign of internal failure) and woo hoo beautiful pressure and volume coach wide! Never could see why it was restricting the flow into the coach. But it definitely was. I control repressive at the shore spigot with a variable/adjustable pressure regulator.

Re: Shore water psi loss.

Reply #20 – June 22, 2018, 05:24:39 pm

Yup, pulling the check valve is next, since I just replaced the 'Everpure' filter (# EV959201) for the Pentair 'QL-3' head, Being the filter has 'O' rings and lockers, it is not easy, given the stupid location, to put pressure on the bottom of the canister to get it up into the head and twist to lock. No leaks, whew! Anyone who has one of these ( Pentair makes fine products) should study the enclosed pics and bookmark them (you can't read the instructions on the canister!). Mite need some help from the DW or other to get it up and set, since you can't see the body whilst laid-out on the floor trying to push!

Re: Shore water psi loss.

Reply #21 – June 26, 2018, 06:10:00 pm

Yes, It was the check valve. I took out the cover box from the compartment forward of the wet bay and removed the check, tested it, junk. Found a brass version. I'm happy! (so is the DW!).

Re: Shore water psi loss.

Reply #22 – June 26, 2018, 07:48:25 pm

Glad you are back "wet again".

Yes, the inlet check valve/back flow preventer was the likely suspect, given your symptoms.

Re: Shore water psi loss.

Reply #23 – June 26, 2018, 08:52:55 pm

Wet is good (except in the PNW in December!) The fact that the anti-siphon valve lasted so long is amazing. I'm not even going to put the fresh brass unit into my files, given how long they last. Pulling the wall cover off the bay forward was the secret to success!

Re: Shore water psi loss.

Reply #24 – June 26, 2018, 09:37:31 pm

Before I put in my new anti-siphon valve I unscrewed the in line at the tank fill shutoff valve and then hooked up a hose and "back flushed" the line. I capped the outlet end with an old sock (no holes) with a rubber band and banged on the water line wherever I could all the way back while the hose was running. Absolutely amazing how many mineral deposits pieces came out!!

Now check the screens on your faucets, seeing as how you have been disturbing the water lines.

By the way, my new anti-syphon valve comes apart if you push the end in. Save the little white collar and when you take the valve off it is a simple job to just push the collar back over the hump on the shaft. Really nice friendly design, not like the old one with the steel pin that can get lost easily because it is so small. One less part!!

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