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Old 12-02-2008, 06:23   #1
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Water pressure pump problem

My water pressure pump used to cycle once every hour or so, but now it will run all the time (unless I shut it off). Am I correct in assuming this means I need a new set of diaphrams, etc. for the pump?
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Old 12-02-2008, 06:36   #2
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No, I think there's a leak in the line somewhere. The pump should only cycle when you turn a tap on. The most likely place for a leak is at your hot water tank. A small drip will make the pump cycle every hour or so, cycling all the time means a bigger leak. I am assuming you do not have a accumulator tank. The pump sound fine.
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Old 12-02-2008, 08:36   #3
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Water pressure pump

You don't say what kind of water pump. If you have one of the old piston type, it is probably the pressure sensor which is in the "out" side of the pump housing. You have one of the newer ones, the pressure sensor is built into the motor and is very difficult to repair (mine is screwed up and I replaced the pump end, but the sensor wires go back into the motor where the sensor apparently is integrated with the pump).
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Old 12-02-2008, 09:59   #4
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If you are losing water then you have a leak. (I know that is blatantly obvious but I had to say it because it is one of two possibilities.) If the pump cycles and you are not losing water then the internal pump seals need to be replaced. In that case, it is better to buy a new potable water pump (F/W pump) because it is not worth replacing the seals. Lots of Jabsco, Shurflo or Groco 12 volt pumps will work. You can get a cheapie for roughly around $100 bucks. The R/V places sell them for less than the marine stores. Your F/W pump is not going to be exposed to salt water so whats the difference?

You might also consider an accumulator tank (pressure reservoir) which will reduce the cycling after your F/W system is working properly.
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Old 12-02-2008, 11:12   #5
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Aside from all the obvious of a leak somewhere, yes the pump can also be the issue. There are a few internals that can allow the pressure side to slowly leak back to the low pressure side and cause the pump to cycle again. As suggested above, check out your system for possible leaks and drips, then if all is well, replace the internals of the pump. These are usually available as a kit form and not expensive. Well worth carrying a spare kit if you intend to go off shore.
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Old 22-02-2008, 07:23   #6
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FYI: I replaced the pump and it seems to have solved all the problems. The one I took out was a 1992 built Sureflo. The boat has been liveaboard for several years, so assume that pump has had a good workout. I replaced it with another Sureflo. So far, so good.
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Old 22-02-2008, 08:50   #7
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The pressure cut off switch was busted.
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Old 22-02-2008, 09:10   #8
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Quote:
Originally Posted by defjef View Post
The pressure cut off switch was busted.
yes, that seems the most logical explanation.
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