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Old 08-07-2016, 01:28 PM   #1
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Uneven water flow...

We have a Jabsco fresh water pump hooked up to an accumulator tank, but the water flow is uneven, from full flow, to just a trickle with the pump cycling on and off. Does this have something to do with the air pressure in the accumulator tank?
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Old 08-07-2016, 02:02 PM   #2
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Could be. The tank should have a Schrader (bicycle tire type) valve. Check the pressure the same way you would on a bike. Each tank size, style and manufacturer will have a recommended pressure for the tank.
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Old 08-07-2016, 02:27 PM   #3
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Quote:
Originally Posted by ancora View Post
We have a Jabsco fresh water pump hooked up to an accumulator tank, but the water flow is uneven, from full flow, to just a trickle with the pump cycling on and off. Does this have something to do with the air pressure in the accumulator tank?
Do you have a inline water filter ?
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Old 08-07-2016, 02:58 PM   #4
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No inline water filter.
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Old 08-07-2016, 03:46 PM   #5
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Could also be the pressure switch on the pump.
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Old 08-07-2016, 04:19 PM   #6
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Sounds like you've lost your accumulator pre-charge. Like Larry says, it could be an easy fix.
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Old 08-07-2016, 04:25 PM   #7
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My first thought is the accumulator tank is water logged and needs to be pressurized or replaced.

Another possibility is that your pump should not be connected to an accumulator tank. Some Jabsco pumps are variable speed and shouldn't be used in a system with an accumulator tank. It seems to confuse them. You can look up your pump on the Jabsco website or just post the model number here and I can tell you.

It might be the pressure switch, but probably not. They usually fail either off or on, not switching on and off.
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Old 08-07-2016, 06:20 PM   #8
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HopCar is absolutely correct on both potential culprits. If you are using your accumulator tank with the proper pump and you need to recharge the air be sure to turn the pump off and drain some water prior to recharging. Once a tank gets waterlogged and creates a cycling effect on the pump it is usually an indication of the air bladder inside being ripped/torn or holes in it that allow the air to mix with the water and eventually losing all or most of the air. The air charge and the pressure switch are somewhat matched.

If your pump is a variable speed "on demand" type it does often get confused with an accumulator tank.
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Old 08-07-2016, 07:12 PM   #9
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I got the pump from the discard table at the club, and rebuilt it. Of course there was no accompanying paperwork on it, so I don't know whether it even needed the existing accumulator tank. Will have to so some research on it.
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Old 08-07-2016, 08:11 PM   #10
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Ancora if the label is still on it the model number will look like this: 12345-0000
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Old 08-07-2016, 08:16 PM   #11
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Quote:
Originally Posted by ancora View Post
I got the pump from the discard table at the club, and rebuilt it. Of course there was no accompanying paperwork on it, so I don't know whether it even needed the existing accumulator tank. Will have to so some research on it.
Sure hope its prior service was as a FW pump and not a macerator pump!!
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Old 08-08-2016, 04:51 AM   #12
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Quote:
Originally Posted by FlyWright View Post
Sure hope its prior service was as a FW pump and not a macerator pump!!
Right on Al. Maybe it was a 'Trump Pump'..? Might be time old tightwad recycler ancora shouts himself a new one..?

holds out hand to be smacked, but he asked for it. After all he did say...

"I got the pump from the discard table at the club, and rebuilt it."
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Old 08-08-2016, 05:27 AM   #13
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For many boats this is normal.

The pressure tank will hold water at the highest pressure the pump is set for.

The pump will not turn on till the pressure is lowered to the pressure switch cut on point.

Perhaps 10 or 15PSI below full pressure.

At that point the pump is attempting to feed the open faucet , and also repressurize the tank.

IF the pump is undersized it may not even be able to maintain cut on pressure while the tap is wide open.

Too long a suction or pressure run with too many fittings will work even a great pump very hard .

IF it means a lot to fill the washer or dishwasher fast , or to take showers while using tap water a pair of pumps in parallel will be less costly than a real big pump, and perhaps use less electric with low water loads.
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Old 08-08-2016, 09:42 AM   #14
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Goin' to the boat today and get some numbers off the pump.
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Old 08-08-2016, 02:00 PM   #15
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When my water flow gets like that I have to clean out the aerator screen. Even though I have a sediment filter sometimes they clog up.
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Old 08-08-2016, 10:40 PM   #16
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Is this recent?

I have a Groco accumulator. After 20+ years of good service I realized some thing was not right. Pump short cycling, no big shot of water. First thought was the bladder had given up.
Nope, but I realized the bladder had lost its air charge down to a level the bladder could not work. On my 1 gallon Groco the pressure must be about 18psi. After recharging to 18 psi it has been working fine for the last two years. Now I check it once a year.
That air valve, Schrader, is not forever and allows a tiny bit of air to leak out.

The system must be depressurized to check the bladder pressure. It needs to be set with no water pressure applied.

If it was working before then check the pressure before doing anything else.
If the pump is new to you and is showing the problem only after the new was installed then the other points may well apply, but find out first. Check the bladder charge pressure.
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Old 08-09-2016, 10:22 AM   #17
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The pump is a JABSCO PAR MAX 3, Model #30600-0012. Found it in my 1996 JABSCO catalog, but no mention whether it needs an accumulator tank.
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Old 08-09-2016, 11:12 AM   #18
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Quote:
Originally Posted by ancora View Post
The pump is a JABSCO PAR MAX 3, Model #30600-0012. Found it in my 1996 JABSCO catalog, but no mention whether it needs an accumulator tank.
Yes you want to use an accumulator tank with that one. I think we're back to a waterlogged accumulator tank.
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Old 08-09-2016, 11:38 AM   #19
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Previous boat had a Jabsco water pressure pump. It appeared to have failed. I replaced it with another, new one and while doing so, found that those pumps have a small filter at the intake. Mine was dirty.

Make sure the filter's clean while you're groveling around in the crawl space.
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Old 08-10-2016, 10:06 PM   #20
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Or loss of air charge pressure.
If the bladder has failed then it,s a new accumulator time but be sure.
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