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Dene
Joined: 27 Nov 2007
Posts: 444
City/Region: Kalama
State or Province: WA
Vessel Name: Fear Naut & Terra-Sea-Ta
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 Posted: Sat Feb 21, 2009 5:55 pm Post subject: Water pump problem |
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In my Campion, I have a simple water system.....no hot water. Just flip the faucet knob and the water pump engages. It's always powered. The brand name of the pump is Togmaz or something like that (it's buried).
Anyway...during the last freeze, I drained the water tank completely through the sink. Today, I filled it and turned on the faucet. No joy. I can hear the pump working. Did I lose my prime or what?
Thought it would be wise to ask before I go tearing into it.
-Greg |
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SEA3PO
Joined: 02 Nov 2003
Posts: 1835
City/Region: Chester
State or Province: CA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: SEA3PO
Photos: SEA3PO
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| Posted: Sat Feb 21, 2009 7:57 pm Post subject: |
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What's a Campion ??
Joel
SEA3PO |
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helm
Joined: 26 Sep 2007
Posts: 273
City/Region: Medford
State or Province: OR
C-Dory Year: 2006
C-Dory Model: 25 Cruiser
Vessel Name: Chack Chack
Photos: Chack Chack
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| Posted: Sat Feb 21, 2009 9:30 pm Post subject: |
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On our CD 25 if we drain our water tank dry I have to literally suck on the shower spray head with the pump running until water is flowing even though the pump is supposedly self priming. I think the tubing from the water tank to the pump develops an air lock. You may just have to apply negative pressure to your water outlet (eg suck on it) with your pump running to get the water going. I am sure there must be a more elegant solution out there.
Eric |
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Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
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| Posted: Sun Feb 22, 2009 12:12 am Post subject: |
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| SEA3PO wrote: | What's a Campion ??
Joel
SEA3PO |
It's a boat manufacturer: Campion Boats
Joe.  
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Sea Wolf, C-Brat #31
Lake Shasta, California
  
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous |
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Dene
Joined: 27 Nov 2007
Posts: 444
City/Region: Kalama
State or Province: WA
Vessel Name: Fear Naut & Terra-Sea-Ta
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| Posted: Sun Feb 22, 2009 12:20 pm Post subject: |
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| helm wrote: | On our CD 25 if we drain our water tank dry I have to literally suck on the shower spray head with the pump running until water is flowing even though the pump is supposedly self priming. I think the tubing from the water tank to the pump develops an air lock. You may just have to apply negative pressure to your water outlet (eg suck on it) with your pump running to get the water going. I am sure there must be a more elegant solution out there.
Eric |
Your solution sucks!! 
I'm going to give it a try tomorrow. Stay tuned.
-Greg |
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Grumpy
Joined: 10 Oct 2005
Posts: 1606
City/Region: Whidbey Is
State or Province: WA
Vessel Name: Kingfisher II
Photos: Kingfisher
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| Posted: Sun Feb 22, 2009 12:58 pm Post subject: |
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I had the same problem with my fresh water pump and I found that if you attach a manual bilge pump with duct tape you can suck a whole lot harder. Only problem is that whent he pressure comes on you get a free shower.
Probable cause was small piece of debris in check valve so it lost prime and/or a loose connection so it could suck air.
Merv
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2006 CD-22 Kingfisher Sold Jan 08.
1987 Arima SeaChaser 17, Sea Star. Sold May 2010
2008 RF246 Kingfisher II Sold Apr 2013 |
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Pat Anderson
Joined: 02 Nov 2003
Posts: 8553
City/Region: Birch Bay, WA
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: Daydream
Photos: Daydream and Crabby Lou
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| Posted: Sun Feb 22, 2009 1:02 pm Post subject: |
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Guys - the opposite of negative pressure at the outlet is positive pressure at the inlet! Put a hose in the water filler, use a rag to get some pressure going, and your non-self-priming self-priming pump will start pumping fine! A little easier than sucking on the shower head I think!
_________________
DAYDREAM - CD25 Cruiser
CRABBY LOU - CD16 Angler (sold 2020)
Pat & Patty Anderson, C-Brat #62!
http://daydreamsloop.blogspot.com
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Grumpy
Joined: 10 Oct 2005
Posts: 1606
City/Region: Whidbey Is
State or Province: WA
Vessel Name: Kingfisher II
Photos: Kingfisher
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| Posted: Sun Feb 22, 2009 1:23 pm Post subject: |
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Pat,
You are obviously bidding for a winner in your long saga of mechanical adventures 
For anyone trying Pat's suggestion, also apply finger to hole in water tank vent unless you want to get very wet. On the CD22 this would produce a lovely "water feature" just to port of the rear door 
Don't ask...
Merv |
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Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
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| Posted: Sun Feb 22, 2009 2:57 pm Post subject: |
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| Pat Anderson wrote: | | Guys - the opposite of negative pressure at the outlet is positive pressure at the inlet! |
Actually, from physics point of view, there is no such thing as suction!
But don't tell that to the wrong persons under the wrong circumstances!
There is only positive pressure. A difference is positive pressure from one place to another place results in fluid (air or liquid) flow from one place to the other.
Therefore, you really can't suck on anything, but you can create a region of lower pressure, which then allows the greater force behind the higher pressure region to push that liquid in the direction of the lower pressure.
This is important in all types of science, from the weather to space travel to hydraulics to automotive engineering.
If you get a glass tube 100 feet long, put one end under water, and put a vacuum pump at the top end and run it for a long period, you'll find that you can't "suck" the water up any higher than about 33 feet or so. That's because even with zero pressure at the top end, the air pressure pushing down on the water's surface can't push the water up into the tube any more than the 33 or so feet, depending on the air pressure that day.
Incidentally, we've created a barometer in the process above, and can now use it to measure the air pressure and variations as the hours and days go by.
The inconvenience of the 30+ foot tube leads instrument makers to use liquid mercury instead of water, as the density of mercury is 13.5 g/cm∧3 , or 13.5 times that of water, and the liquid column can be shorted proportionately (inversely), to about 30 inches. (Most modern mobile barometers are aneroid, using a bellows tank that expands and contracts to measure air pressure.)
This also means that the same weight of force or pressure equaled by the 33 feet of water column works under water, too. So for every 33 feet you go down under water, the pressure created by the weight of the liquid above goes up by the equivalent of one atmosphere, or about 15 lbs, per square inch, so that at 66 feet, there's 2 atmospheres, or about 30 lbs/sq.", and at 330 feet, 10 atmospheres, or about 150 lbs./sq. ".
Bla, bla, bla, etc.
Now how much of that did you suck up and was it worth it?
Joe. |
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