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Old 11-12-2011, 07:40 PM   #1
Rivet Master
jdalrymple's Avatar
2009 27' FB Flying Cloud
1991 35' Airstream 350
Jay , Oklahoma
Join Date: Oct 2006
Posts: 1,695
Anyone added an accumulator tank?

I would like to know if anyone here has added an accumulator tank in line with one of the new Shurflo variable speed pumps. My ’09 has the 4900 series from the factory, and I am not completely satisfied with its performance.
It is my understanding the variable speed pumps are supposed to be more like home flows, with less surging and even pressure. I have not seen that. I have been in trailers with accumulators and they seem better.

So, after stopping a Camping World and checking that the tank would fit and the install would be easy, I bought one. Got ready to put it in today and the instructions did not recommend using the tank with a variable speed pump.

Has anyone out there done it anyway?

Jeff & Cindy
'09 27FB Flying Cloud
'91 350 LE MH
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Old 11-17-2011, 01:48 PM   #2
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2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,166
The problem with using an accumulator with a variable speed pump is that the pump will tend to alternate between full speed and "off" rather than finding the proper speed for the flow rate.

I too have found that the control for the variable speed pump doesn't really work as well as it should.
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Old 11-17-2011, 04:26 PM   #3
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, Minnesota
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I have an accumulator tank and a VS pump. Works great. The pump will start off real slow and gradually build up speed as required. It sounds like a large cat purring.

My pump is a FloJet VSD 4.5 gpm, but I don't know if that would make a difference.
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