| Author | Message | ||
| Jim Wilkerson (Wagwar)
Registered Member Username: Wagwar Post Number: 58 Registered: 12-2009 Posted From: 99.109.187.242 Rating: N/A |
Hi, I have a small 2.8 gpm Shurflo pump in the fresh water system. When I first installed it, it would pump the water continuously w/o pulsing very much, now it pulses by turning itself on/off very quickly. It's brand new and had no more than an hour of use total. Why is it pulsing so much? BTW, I've ordered one of those small Shurflo accumulator tanks to add. Will that fix it? Thanks! | ||
| Tim Brandt (Timb)
Registered Member Username: Timb Post Number: 542 Registered: 10-2003 Posted From: 66.165.176.62  Rating: |
If it hasn't always done it I might quesiton what has changed. Pressure switch problem? something cracked in the winter? That said I have the shureflow accumulator and it helps a great deal | ||
| Jim Wilkerson (Wagwar)
Registered Member Username: Wagwar Post Number: 59 Registered: 12-2009 Posted From: 99.109.187.242 Rating: N/A |
Hi Timb, Nothing has changed that I know of, just installed it last week. | ||
| les marston (Les_marston)
Registered Member Username: Les_marston Post Number: 87 Registered: 1-2010 Posted From: 68.151.225.213 Rating: N/A |
Shurflo pumps have a built in pressure switch that will work with or without an accumulator. What is happening is the pump is able to pump water at a rate that is faster than you are using it then the pressure in the line drops and the pump turns back on again to repeat the process over and over again very quickly giving you that pulse effect. If nothing has changed then the setting on the pressure switch needs to be adjusted up by using a small allen wrench on the end of the pressure head and turning the set screw in a small amount. Other possibility is that your outlet line is restricted probably close to where it comes out of the pump head. Make sure that the suction side of the pump is also not restricted and that the suction line is at least as big as discharge. It is not uncommon for this type of pump to run for a few seconds after the tap is closed. The pressure switch and for that matter the whole pump are pretty tough. I use dozens of them and they for the most part don't fail often. Only things they don't like are to be frozen with water in them (no brainer) Non RV anti freeze, high chlorine for long periods of time. and most hydrocarbons Hope that helps Les The water guy | ||
| Edward J. Sommers (Sommersed)
Registered Member Username: Sommersed Post Number: 55 Registered: 10-2004 Posted From: 148.63.161.138 Rating: N/A |
In addition to normal restrictions, some things that can affect the normal output pressure are temperature, pressure due to altitude, condition of and available voltage of the batteries, and a few other things. The chances are that if you could not hear the pump run you would barely notice the result of pulsation. Ed | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 1219 Registered: 10-2006 Posted From: 99.168.83.142  Rating: N/A |
A big accumulator will give the pump the longest life. I like the 1 gal units frequently used as expansion tanks on hot water heating furnaces. 6 gal (or more!)would be better , bur would take up even more room. The bigger advantage to the 6 gal is when you actually run the FW tank out of water , a bit can be had from the accumulator , as well as what is in the HW heater. It probably ran OK at first fill from air in the system , usually in the HW tank. How much do you boondock? The downside to a big accumulator tank is the system can have a small leak, and its harder to hear it. FF (Message edited by Fast_Fred on June 29, 2010) | ||
| Mike Eades (Mike4905)
Registered Member Username: Mike4905 Post Number: 202 Registered: 12-2000 Posted From: 70.127.151.164 Rating: N/A |
You might have a very small leak in the sys. I had a faucet that would once in a while and my pump would pulse. |
