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Old 06-14-2018, 10:35 PM   #1
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New Jabsco Variable Speed Pump

Looks like Jabsco has come out with a new improved variable speed water system pump. I like variable speed pumps because they eliminate the need for accumulator tanks.
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Old 06-15-2018, 06:31 AM   #2
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"I like variable speed pumps because they eliminate the need for accumulator tanks."

One reason I prefer the older style, the accumulator tank can cause the pump to cycle on 1/10 or fewer times ,saving juice and wear.

I believe the low flow is created by bypassing already pressurized water , that my battery already pressurized.
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Old 06-15-2018, 08:23 AM   #3
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"I like variable speed pumps because they eliminate the need for accumulator tanks."

One reason I prefer the older style, the accumulator tank can cause the pump to cycle on 1/10 or fewer times ,saving juice and wear.

I believe the low flow is created by bypassing already pressurized water , that my battery already pressurized.
No, like the first sentence in the quote says, it is a variable speed pump so it only runs at a speed required to maintain the flow. There is no bypass.

But Cruisersforum reports problems with the flow sensor and when the voltage supply is low. So I would stay away from them until these get sorted out.

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Old 06-15-2018, 08:28 AM   #4
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Anytime I see " improved " makes me suspect ..... The road to many garbage bins is paved with things that were " improved " ... just sayn' fb
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Old 06-15-2018, 09:04 AM   #5
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ShutFlo tried to make a variable speed pump but had problems and switched to by pass pumps. These work very well.

Jabscoís first variable speed pump had problems also. Their second version was pretty good. I donít recall any being returned to me under warranty. This is the third version. Time will tell how good it is.

A lot of the problems with variable speed pumps was because people didnít remove their accumulator tanks when they installed the new pump. The accumulator tank seems to confuse the pump.
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Old 06-15-2018, 09:11 AM   #6
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ShutFlo tried to make a variable speed pump but had problems and switched to by pass pumps. These work very well.

Jabscoís first variable speed pump had problems also. Their second version was pretty good. I donít recall any being returned to me under warranty. This is the third version. Time will tell how good it is.

A lot of the problems with variable speed pumps was because people didnít remove their accumulator tanks when they installed the new pump. The accumulator tank seems to confuse the pump.
So a bypass pump does it run all the time?
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Old 06-15-2018, 09:33 AM   #7
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So a bypass pump does it run all the time?
It runs continuously at full speed as long as there is an open faucet. Any water in excess of what goes out the faucet is diverted back to the intake side of the pump.
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Old 06-15-2018, 10:14 AM   #8
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I would not spend a dollar for anything labeled jabsco ,new and improved or old and worn out
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Old 06-15-2018, 10:21 AM   #9
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ShutFlo tried to make a variable speed pump but had problems and switched to by pass pumps. These work very well.

Jabscoís first variable speed pump had problems also. Their second version was pretty good. I donít recall any being returned to me under warranty. This is the third version. Time will tell how good it is.

A lot of the problems with variable speed pumps was because people didnít remove their accumulator tanks when they installed the new pump. The accumulator tank seems to confuse the pump.
My VSD pumps lasted about 7 years with no problems, although I must say, the Headhunter pump I replaced them with is really nice.
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Old 06-15-2018, 10:34 AM   #10
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I've had a few Jabsco VS pumps, never had one fail unless it froze. The "new and improved" on this one is a bunch of diagnostic functions - low or high voltage, high current, on too long, etc. The knock against them in the RV world is that some of the limits are set too tight, so you get nuisance shut downs. The one thing I'd really like about this one is that it shuts off after running continuously for 5 minutes or something like that, this keeps from flooding your boat with fresh water should a hose break.
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Old 06-15-2018, 11:41 AM   #11
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I would not spend a dollar for anything labeled jabsco ,new and improved or old and worn out
Well bully for you! What's your reason? I had two Jabsco raw water pumps on my Detroit engines, an overboard macerator pump and a utility pump and all were good, long-lived products. Wouldn't hesitate to purchase again.
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Old 06-16-2018, 08:00 AM   #12
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Another reason for preferring an accumulator is hot water.

If an engine loop is sourced for HW the water temp can get to the same temp as the engine coolant.

A cold box of water will expand quite a bit , so the safety of the water system may depend on the over pressure/over temp valve on the HW heater.

These usually release at over 100psi which is far beyond what many boat FW water systems were designed for.

An accumulator built for potable water , and a dumb water pump solve many hassles.
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Old 06-16-2018, 09:11 PM   #13
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Quote:
Originally Posted by HopCar View Post
ShutFlo tried to make a variable speed pump but had problems and switched to by pass pumps. These work very well.

Jabscoís first variable speed pump had problems also. Their second version was pretty good. I donít recall any being returned to me under warranty. This is the third version. Time will tell how good it is.

A lot of the problems with variable speed pumps was because people didnít remove their accumulator tanks when they installed the new pump. The accumulator tank seems to confuse the pump.
What sort of problems happened because a VS pump was installed w/o removing the accumulator?


I have a Shurflo Smart Sensor. Do I need to remove the accumulator?
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Old 06-16-2018, 09:30 PM   #14
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Also these variable speed pumps do not play well with water filters which is not documented but the factory told me after mine kept shutting down
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Old 06-16-2018, 09:56 PM   #15
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What sort of problems happened because a VS pump was installed w/o removing the accumulator?


I have a Shurflo Smart Sensor. Do I need to remove the accumulator?
The ShurFlo Smart Sensor pumps were their variable speed pumps which were replaced by the Aqua King II by pass pumps.

I think the accumulator tanks caused the VS pumps to change speed erratically.

If your system is working now, donít mess with it. When the pump fails, and all pumps fail eventually, consider removing the accumulator and replacing the pump with either a ShurFlo By Pass pump or the Jabsco VS pump.

If you decide to keep the accumulator tank, just get a regular pressure switch controlled pump. No need to spend extra for a VS or by pass pump.
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Old 06-16-2018, 10:01 PM   #16
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I had one of the early ones in a previous boat. It made too many growling noises so I removed it and went with a conventional pump.
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