What happened to the water pressure? - SailNet Community
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post #1 of 38 Old 04-07-2019 Thread Starter
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What happened to the water pressure?

So I filled the water tanks and turned the pressure water pump on and expected it to pressurize the system and then stop... and for there to be decent pressure at each of the two faucets.

Pump came on and didn't stop... and water pressure / volume as very very low... too low to use. So I am thinking.... there's an air leak and so the system can't pressurize... or... the pump is not functioning. Didn't have time to do an exhaustive search for a leak.... saw not signs of water in the bilge from a broken hose or loose connection.

I am thinking to replace the pump and if that's the problem... repair the old one and keep it as a spare. If it doesn't solve the problem it's a sign of breach in the system and I'll have to find it.

Only change to the system was a new Raritan water heater was installed. But that's a closed loop.

I will return to the boat and see what I can figure out. I think I have a spare pump or two... and if not I'll buy one. Any recommendations for a 2 fixture system? Looks like product offerings have changed since I installed the present one. which was installed in '14 so it's not all that old.

Any suggestions???

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post #2 of 38 Old 04-07-2019
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Re: What happened to the water pressure?

is the water heater full if not it may take a long time to build pressure with air in the system. air has to compress before you will build system pressure. water does not compress so it will build pressure quickly once the air is purged out of the system.

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Re: What happened to the water pressure?

Rapp yer lips around the open tap and suck. By the sound of the running pump you can tell if it's getting a prime
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Re: What happened to the water pressure?

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Originally Posted by Capt Len View Post
Rapp yer lips around the open tap and suck. By the sound of the running pump you can tell if it's getting a prime
How could any water flow to a faucet if there was no prime. Pump is pushing some water.... not much. though,

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post #5 of 38 Old 04-07-2019
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Re: What happened to the water pressure?

Sounds like a blog between the tank and the pump.I would disconnect the pump and blow some compressed air into the tank. That has worked for me.
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Re: What happened to the water pressure?

I mean clog.
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Re: What happened to the water pressure?

Is this a diaphragm or a belt drive pump?

If diaphragm, I have had loose connections on the input line to the pump so the pump was sucking mostly air and a little water, but not leaking. The connection was a sort of quick connect with a slider that pushed in to lock. The slider had popped out and all it took to fix the problem was pushing it back in again.

I have also had loose/slipped/stripped belts on belt drive pumps that resulted in low water pressure. Again no leaks. The fix was to replace the belt.

Good Luck!
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post #8 of 38 Old 04-08-2019 Thread Starter
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Re: What happened to the water pressure?

I am going to investigate this afternoon.... didn't have time yesterday and didn't expect any problems. Clearly some water is getting to the faucet. Foot pump works fine too. This is making be believe an air leak or a faulty ShurFlo pump. If the pump does not shut off it tells me that the system is not pressurizing.... but why? an air leak? water leaking as well??? or faulty pump?

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post #9 of 38 Old 04-08-2019
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Re: What happened to the water pressure?

My water system does this same thing sometimes when the tank runs dry.....I have to bleed the air out of the system by turning on the pump and opening up the faucet farthest from the pump, which happens to be the hand shower in the lazarrette.
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post #10 of 38 Old 04-08-2019 Thread Starter
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Re: What happened to the water pressure?

Thanks for the comments... In the past I left the tap open until the water flowed well. Didn't work this time. Stay tuned.

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