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Old 04-27-2014, 03:01 PM   #1
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Water pulses

Need some help or an old thread. Took trailer out of bypass today. Just installed accumulator to shurflo pump and charged to 45 psi. When I run the water from the tank, the flow continues to pulse for long periods. Once water is shutoff, the pump runs for about 10-15 seconds and then stops as expected. Faucet spits like there is air entrapped. If I run on city water, the flow is good after opening a few faucets and toilet. Then if I go back to the tank it chugs again. Does the tank level affect the flow. I didn't fill the tank to much. Thanks.
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Old 04-27-2014, 03:11 PM   #2
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Try putting more water in the fresh water tank. It's easy to drain if thats no the problem.
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Old 04-27-2014, 03:44 PM   #3
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Filled tank and flow was better but then started spitting again. Water pump kicks on about 5-10 seconds after faucet opened. Considering removing accumulator to see if that changes anything. We only had the trailer out two times last year, both on city water. This might have been a problem from the beginning. My old pop up worked better than this before and after I added accumulator.
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Old 04-27-2014, 06:07 PM   #4
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There could be air trapped in the lines at one of the faucets. When turning on the pump, I always bleed the air from both the cold and the hot lines at each faucet starting at the one closest to the water pump. Don't forget the outside shower also if your RV is equipped with one.
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Old 04-27-2014, 06:23 PM   #5
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Quote:
Originally Posted by fmichaels View Post
Need some help or an old thread. Took trailer out of bypass today. Just installed accumulator to shurflo pump and charged to 45 psi. When I run the water from the tank, the flow continues to pulse for long periods. Once water is shutoff, the pump runs for about 10-15 seconds and then stops as expected. Faucet spits like there is air entrapped. If I run on city water, the flow is good after opening a few faucets and toilet. Then if I go back to the tank it chugs again. Does the tank level affect the flow. I didn't fill the tank to much. Thanks.
Did you pressurize the accumulator to 45 PSI? That should not be that high if so. They normally come pre-charged and it should be a lot lower than that at more like 20-25 where your pump kick on is set. If the accumulator cannot accept water it is not doing it's function which is to take 1-2 gallons of water and then feed the system that 12 gallons of water after the pump has kicked off.

If you did not set the psi to 45 then I would check for leaks somewhere.
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Old 04-27-2014, 06:32 PM   #6
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A few questions? Where did you install your accumulator and what size accumulator did you get? RV accumulators use a rubber diaphragm that separates the water from the air charge. Accumulators are supposed to be installed directly downstream from the pump. You need to set the accumulator pressure to exactly the same pressure is the pump turn on pressure in a static condition i.e. pump is turned off but at least one faucet is open. For example a 45 psi demand pump typically has a turn on pressure of 30 psi. In this case you would set the accumulator pressure to 30 PSI. If the pressure set too high in the accumulator capacity is reduced or potentially even eliminated because the accumulator would be at the same pressure as the plumbing lines are. This would mean that the accumulator essentially becomes worthless in this condition, however it can actually trap air creating other problems.
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Old 04-27-2014, 09:26 PM   #7
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Ok, so I installed the accumulator just downstream of the pump. I did charge it to 45psi after reading the directions and realize now that was wrong. I will reduce the pressure down to about 30 psi tomorrow and see it that helps. I also didn't see any leaks. The accumulator was the model meant to be used with a Shurflo 4000 series pump. I have a 4008 model pump. The accumulator pre-charge was 39psi. Thanks for your help. I will report back tomorrow.
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Old 04-27-2014, 10:05 PM   #8
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Ok, for those of us that don't know, what is a accumulator, and why do I want one?
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Old 04-27-2014, 10:46 PM   #9
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An accumulator basically keeps the water system under pressure (when not using city hook-up) and helps your water pump cycle less (extends life). They also quiet down the system. There are a number of dry sites that we visit so I like to have an accumulator when running off the water tank.
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Old 04-27-2014, 11:03 PM   #10
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Just sits in line with the pump?

powered, or just uses water pressure from the pump?
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