Shureflo pump pulsing (1 Viewer)

Griff097

LIFE MEMBER
May 19, 2021
135
181
Cardiff, UK
Funster No
81,332
MH
Rollerteam 685
Anyone else got a Rollerteam with a Shurflo pump?

Just picked up a new to us 2018 685 and when you open a tap slowly the water pulses and the pump is making a loud pulsing noise which carries on for a few seconds after closing the tap.

Are they all like this or do I maybe need to fit an accumulator etc

I have searched the forum but can't find quite the same description of fault.
 
Feb 21, 2016
4,910
29,131
Uk
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41,726
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C class
Exp
Since 2017
Thought they all did that...ours does. If the pump is too noisy it may be because of the way it’s fitted e.g.vibrating in confined space or lack of insulation.
 
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Robert Clark

Deleted User
On our pump, on the end of the pump there is a tiny Alan key adjustment. It’s part of the pressure switch and you’ll see wires coming out of the switch.
Adjusting the screw whilst the tap is running will stop the pulsating

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Griff097

Griff097

LIFE MEMBER
May 19, 2021
135
181
Cardiff, UK
Funster No
81,332
MH
Rollerteam 685
On our pump, on the end of the pump there is a tiny Alan key adjustment. It’s part of the pressure switch and you’ll see wires coming out of the switch.
Adjusting the screw whilst the tap is running will stop the pulsating
Thanks guys I will have a look when we get back.

I was saying to Quackers last night how friendly and helpful this forum is.
 
Jan 19, 2014
9,319
24,564
Derbyshire
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29,757
MH
Elddis Accordo 105
Exp
since 2014
Still got our setup instructions 😎

20210602_100155.jpg

20210602_100247.jpg
 
Dec 2, 2019
3,554
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Amersham
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67,145
MH
van conversion
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Since 2019
Our pump runs few seconds after closing the tap. We have a small fiamma expansion vessel after the pump to eliminate pulsing. Also when you open the tap, it delays the start, depending on water usage. The expansion vessel holds 1L of water so if you take less, the pump will not start until vessel empties.

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Griff097

Griff097

LIFE MEMBER
May 19, 2021
135
181
Cardiff, UK
Funster No
81,332
MH
Rollerteam 685
I can't seem to find a location for an Allen key, the pumps not that accessible tbh
 

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Griff097

Griff097

LIFE MEMBER
May 19, 2021
135
181
Cardiff, UK
Funster No
81,332
MH
Rollerteam 685
On that pump it will be a Philips screw on the end of the black plastic section.
I will try again tomorrow, struggling with a trapped nerve and unless I can get the table out its nigh on inaccessible for me at 6'5 and the gap between the bottom of the pump and the pipe is pretty slim.

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Aug 18, 2014
23,537
131,291
Lorca,Murcia,Spain
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32,898
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Transit PVC
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16 years since restarting
Try using a mirror to see the screw. What I would suggest though is in yor OP you stated when tap is opened slowly. Yes it will pulse. If not fully open it will continally pulse as it can build up pressure faster than it is being let out of a partially opened tap.
 
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Griff097

Griff097

LIFE MEMBER
May 19, 2021
135
181
Cardiff, UK
Funster No
81,332
MH
Rollerteam 685
Try using a mirror to see the screw. What I would suggest though is in yor OP you stated when tap is opened slowly. Yes it will pulse. If not fully open it will continally pulse as it can build up pressure faster than it is being let out of a partially opened tap.
Pulses heavily at all flow rates not just pulsing but banging.
 
Mar 6, 2008
125
137
Spixworth
Funster No
1,722
MH
Van Conversion Moto-
Exp
Since 2006
I have had various water pumps including Shurflo and the only one that did not pulse was a submersible in a 1995 Swift Kon-Tiki. I have tried the "adjustment" with no difference to the pulsing. If you read all the instructions for setting it there is a bit that mentions any pipework or device that reduces the flow will make the pump pulse. Incidently, the pump pictured is not quite verticle, I wonder if that is a replacement?

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Fat Albert

Free Member
Mar 25, 2021
185
267
Chippenham, UK
Funster No
79,991
MH
Chausson 610 Welcome
Exp
Ex Tugger saw the light in 2019
If it's banging I would suggest looking at the anti vibration rubber mounting bushes between the pump and the attachment bracket. My pump was attached so there was no movement between the pump and bracket. All the pump vibrations were going straight through the van, like living in a loud speaker, amplified by the van structure. I inserted a piece of EPDM rubber sheet between the attachment bracket and the van. It has help but still get the pulsing but the banging is very much reduced that I don't consider it a problem.
 

Campervan_man

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Jun 24, 2019
997
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Funster No
61,896
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Dethleffs Globebus
Exp
2000
If you fit an inline 12MM one way valve in the water line near your "fresh water tank outlet" it stops water running back to the water tank when the pump is OFF.
That stops air pockets being formed in the cold water pipe.

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Pickygame

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Jul 25, 2020
79
97
Funster No
73,445
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Fiat Rapido Itineo M
Exp
Since 2019, caravans from 2010
On that pump it will be a Philips screw on the end of the black plastic section.
Check the filter is full of water while it's running. You may have a crack in the body. I was getting continual running when shut off. I back flowed the pump and it cleared a small piece of debris in the feedpipe
 
Aug 6, 2013
11,941
16,527
Kendal, Cumbria
Funster No
27,352
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Le-Voyageur RX958 Pl
Exp
since 1999
If you fit an inline 12MM one way valve in the water line near your "fresh water tank outlet" it stops water running back to the water tank when the pump is OFF.
That stops air pockets being formed in the cold water pipe.
Two of those are built into the pump. You only need one for an in-tank pump.

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Griff097

Griff097

LIFE MEMBER
May 19, 2021
135
181
Cardiff, UK
Funster No
81,332
MH
Rollerteam 685
If it's banging I would suggest looking at the anti vibration rubber mounting bushes between the pump and the attachment bracket. My pump was attached so there was no movement between the pump and bracket. All the pump vibrations were going straight through the van, like living in a loud speaker, amplified by the van structure. I inserted a piece of EPDM rubber sheet between the attachment bracket and the van. It has help but still get the pulsing but the banging is very much reduced that I don't consider it a problem.
Thanks very much to Fat Albert for sending me some rubber to put behind the pump mountings for free, a generous soul indeed, it has made a little difference and no amount of adjusting the screw on the pump made any difference unfortunately.
There is a loose pipe or flexi in the bathroom that is bouncing off the side of the van with the pulsing just to exacerbate the problem.
Next step will be an accumulator, when I have 5 mins.

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Sep 29, 2019
34
56
Dumfries and Galloway
Funster No
64,815
MH
Solway PVC
Exp
Since 2020
Thanks very much to Fat Albert for sending me some rubber to put behind the pump mountings for free, a generous soul indeed, it has made a little difference and no amount of adjusting the screw on the pump made any difference unfortunately.
There is a loose pipe or flexi in the bathroom that is bouncing off the side of the van with the pulsing just to exacerbate the problem.
Next step will be an accumulator, when I have 5 mins.
If you can get access to that pipe in the bathroom, put some cheap foam pipe insulation around it.
 

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