Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 08-14-2016, 05:30 PM   #15
Junior Member
 
Rolldabones's Avatar
 
Freightliner Owners Club
Join Date: Jul 2012
Location: Carlsbad, NM
Posts: 21
Quote:
Originally Posted by Gordon Dewald View Post
Trying to think this through logically. The fact that it pulses means to me that it is accomplishing the pressure shutting off and then being triggered again to pump more water.

Opening another tap reduces the cycling.

Is there a flow restrictor in your shower? Can you remove it? (you will use more water)!

How difficult would it be to add an accumulator?
I'll have to check on the restrictor in the shower. Good tip!! I don't have an accumulator, and I don't believe it'll be too hard to put in. Some research into that is in the works. This may do the trick. Another member mentioned a leak on the inlet side and maybe sucking air in the system. I see air in the inlet screen cover, so I'm investigating that, too. Thanks!! This wouldn't be such a problem if it wasn't such a random pulsation. But it's so quick and then slow...it worries me only because during fast frequency, it sounds like the pump is going to pop right out of the compartment.
__________________

__________________
Bones
Rolldabones is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-14-2016, 06:11 PM   #16
Senior Member
 
windsorbill's Avatar
 
Monaco Owners Club
Join Date: Jun 2011
Location: Palm Desert, CA
Posts: 624
Bones,


No I don't have an accumulator, but I don't have a pulsing problem either. I would try the suggestion about looking for a flow restrictor in the shower head. It might be in the hose if you have that type. Next, I would check the air leaking into the system before the pump.
__________________

__________________
bill h
06 Windsor PRQ, ISL
2014 Honda CRV
windsorbill is offline   Reply With Quote
Old 08-14-2016, 08:58 PM   #17
Senior Member
 
Join Date: Apr 2015
Location: Rogers, AR
Posts: 381
You have a small accumulator chamber in the top of the water heater tank that may need to be replenished. Just empty out your garden hose and connect the coach up to city water, then turn on a hot water faucet. All the air from the hose will go into the tank to fill the chamber and the excess air will come out the faucet. I do this every time I hook up to city water.
If you want a simple large accumulator tank, use a screened washer to hold the back flow valve open, connect an empty garden hose to the water inlet, cap the other end and it will do exactly what a hard plumed accumulator tank will do, only no cost.
__________________
2017 Fleetwood Discovery 40D w/2012 CRV toad
alank is offline   Reply With Quote
Old 08-15-2016, 12:16 AM   #18
Senior Member
 
AKOne's Avatar
 
Join Date: Jun 2015
Location: Alaska
Posts: 270
Assuming there are no leaks, the solution to a pulsating and noisy pump is a pressure/accumulator tank. $75 to $100 bucks and a couple hours will result in a smooth running quite pump. With a tank the pump will run only when the pressure drops to the trigger point, then the pump will run until the tank is recharged. This is the exactly the same setup found in residential applications that use well water. Here is a link to a picture of my setup: https://1drv.ms/i/s!ArBcunudL8Rp53Yql10ygOswJ6oX
__________________
Tim & Ruth
Alpine Coach 1999 40FDS, 350 ISC
Project Restoration
AKOne is offline   Reply With Quote
Old 08-15-2016, 05:24 AM   #19
Senior Member
 
Join Date: Apr 2015
Location: Rogers, AR
Posts: 381
Is your pump a by-pass type pump that doesn't need an accumulator tank? If so and it pulses, then the pumping pressure is set below the by-pass pressure and the by-pass feature won't work. An Allen wrench in the set screw to increase the pressure will fix it.
My Surflow did the same thing. It was to be a 55 lb. pump but was only pumping 45 lb and wouldn't bypass. Customer service said to crank it up to 55 and all was fine.
__________________
2017 Fleetwood Discovery 40D w/2012 CRV toad
alank is offline   Reply With Quote
Old 08-15-2016, 08:44 AM   #20
Senior Member
 
Gordon Dewald's Avatar
 
Winnebago Owners Club
Join Date: Mar 2014
Posts: 9,175
If I were going to the effort of installing an accumulator I would consider changing the pump for a variable speed. It will be quieter and probably be able to deliver more water. We changed our in the 5er to a variable and were able to run a couple taps where the previous pump wouldn't.
__________________
Gordon and Janet
Tour 42QD/inTech Stacker
Gordon Dewald is offline   Reply With Quote
Old 08-15-2016, 12:17 PM   #21
Senior Member
 
ernest917's Avatar
 
Forest River Owners Club
Join Date: Dec 2010
Location: Woodville, TX
Posts: 509
How about this - just recently I've had this issue....

When I now turn on my water pump, I have water gushing out of the city water fill.... Now sure what's causing that... Plus - after being hooked up to city water, when I disconnect my city water hose water flows out of city water connection.... Is there a baffle inside the city water connection that's failed???
__________________
ernest917 is offline   Reply With Quote
Old 08-15-2016, 06:42 PM   #22
Senior Member
 
Join Date: Apr 2015
Location: Rogers, AR
Posts: 381
ernest917, the first thing the water hits in your coach is a "backflow valve" on the backside of the hose connector, and yours is stuck open. Polk around in there to see if it will close and hold the water, if not, you'll need another one, or keep a hose connected.
__________________
2017 Fleetwood Discovery 40D w/2012 CRV toad
alank is offline   Reply With Quote
Old 08-15-2016, 08:10 PM   #23
Senior Member
 
J. Frank's Avatar
 
Join Date: Apr 2016
Location: Moulton, Alabama
Posts: 186
The majority of RV pumps are diaphragm type pumps, which are what's termed as positive displacement pumps. Basically, it means they will pump pressures very high and will stop building pressure only when shut off or if flow is increased. If you barely crack a faucet you will hear the pump cycle, because the flow is not high enough to relieve the pressure the pump puts up and it shuts off when it reaches its shut off pressure. Then as the flow lowers the pressure, it comes back on and so on. If you open the faucet wide open the pump likely may not be able to raise the pressure fast enough to get to the shut off pressure. Environmental activists have flexed their muscles and have gotten shower head manufacturers to come up with heads that save water by limiting flow, but you do not notice - unless you are using a diaphragm pump, which if the shower head is sized just right the pump will cycle so fast it will literally beat itself to death. The solution is to increase the flow (change shower head to a higher volume one) or as some have said add an accumulator or a pressure tank, as we who used well water used to call it. These tanks work because they have a bladder inside them that is filled with air and they maintain the pressure in the piping longer even though a faucet is open. Opening another faucet will work also. A variable speed rotary pump would be an even better, although expensive, solution, as well.

Hopes this helps.
__________________
Jerry
2016 Gulfstream/Ameri Lite 268BH
/2006 Ford Expedition
J. Frank is offline   Reply With Quote
Old 08-15-2016, 09:52 PM   #24
Senior Member
 
AKOne's Avatar
 
Join Date: Jun 2015
Location: Alaska
Posts: 270
Gordon, a variable speed pump is well suited for accumulator tanks. With a Shurflo pump and an accumulator tank, we too are able to open two faucets at the same time. I expect to get longer life out of the current pump due the much less frequent cycling. The biggest difference in noise was the elimination of the hammer effect the pump creates when coming up to pressure. The tank bladder provides a cushion that results in a much quieter operation and even pressure.
__________________
Tim & Ruth
Alpine Coach 1999 40FDS, 350 ISC
Project Restoration
AKOne is offline   Reply With Quote
Old 08-15-2016, 09:53 PM   #25
Senior Member
 
AKOne's Avatar
 
Join Date: Jun 2015
Location: Alaska
Posts: 270
Jerry explains it much better than I did. Thanks
__________________
Tim & Ruth
Alpine Coach 1999 40FDS, 350 ISC
Project Restoration
AKOne is offline   Reply With Quote
Old 08-16-2016, 08:00 AM   #26
Senior Member
 
Gordon Dewald's Avatar
 
Winnebago Owners Club
Join Date: Mar 2014
Posts: 9,175
Quote:
Originally Posted by AKOne View Post
Gordon, a variable speed pump is well suited for accumulator tanks. With a Shurflo pump and an accumulator tank, we too are able to open two faucets at the same time. I expect to get longer life out of the current pump due the much less frequent cycling. The biggest difference in noise was the elimination of the hammer effect the pump creates when coming up to pressure. The tank bladder provides a cushion that results in a much quieter operation and even pressure.
We changed to a ShurFlow variable speed. Can not tell you what model as we have since sold the 5er. I did not install a tank because the installation instructions specifically stated that the pump was not to be used with an accumulator. May be different for different pumps.
__________________
Gordon and Janet
Tour 42QD/inTech Stacker
Gordon Dewald is offline   Reply With Quote
Old 08-18-2016, 01:10 AM   #27
Senior Member
 
AKOne's Avatar
 
Join Date: Jun 2015
Location: Alaska
Posts: 270
That is interesting. Have no idea as to why ShurFlow would not recommend a tank.
__________________
Tim & Ruth
Alpine Coach 1999 40FDS, 350 ISC
Project Restoration
AKOne is offline   Reply With Quote
Old 08-18-2016, 02:20 AM   #28
Registered User
 
Join Date: Nov 2015
Posts: 2,946
Bones.....

Pump is reaching shutoff pressure set point due to low flow demand then pressure drops to start set point so pump ends up cycling.

Faucet aerators have restricters .....remove them
Shower has restricter either in handle of shower head or in hose. Some cab ve removed others enlarged by using a 1/4" drill bit

__________________

__________________
Old-Biscuit is offline   Reply With Quote
Reply

Tags
water, water pump



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
water pump hums but doesn't pump water msg1951 RV Systems & Appliances 2 04-12-2013 04:36 PM
Water Pump pulses for 1/2 sec every 90 seconds imorton Vintage RV's 23 11-18-2012 02:47 PM
Water Pump won't pump water zzjea RV Systems & Appliances 4 03-06-2012 04:07 AM
Water pump pulses skypilot 5th Wheel Discussion 14 12-04-2007 06:49 AM
Water Pump Pulses Doc Mark Newmar Owner's Forum 15 07-25-2007 12:28 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:23 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.