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Author Topic: Jabsco manual head pump  (Read 2221 times)

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captaingary

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Jabsco manual head pump
« on: June 08, 2001, 10:22:50 AM »

I am looking for others who may have run into this problem. I converted my Jabsco manual head pump to fresh water and the pump is very hard to operate. When using sea water it pumps very freely. I pulled the fill cap off to see if the tank was not venting properly to no avail.
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Gary Schneider
Windmill #1231
Long Beach  CA

Roc

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How did you do it?
« Reply #1 on: June 08, 2001, 11:47:06 AM »

How did you convert the head to fresh water?  If you explain how, maybe something can be figured out why it's hard to pump with fresh vs. sea water.
 
 Roc-
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Roc - "Sea Life" 2000 MKII #1477.  Rock Hall, MD

captaingary

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Jabsco manual head pump
« Reply #2 on: June 08, 2001, 01:38:51 PM »

I put a "T" in the fresh water supply from the tank and ran it to a "Y" valve in order to select fresh or sea water for flushing. That way I can switch back to sea water when I go on a long trip. From the "Y" valve it goes straight to the head pump.
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Gary Schneider
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Roc

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Pressure
« Reply #3 on: June 13, 2001, 05:00:28 AM »

The only thought I have is the hoses that come from the water tank is 1/2 inch.  The hose that usually supplies the head is 3/4 inch.  Maybe the restricted diameter is making it harder to pump??  Just a guess.
 
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Roc - "Sea Life" 2000 MKII #1477.  Rock Hall, MD

sailinsfb

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Head Pump restriction
« Reply #4 on: June 15, 2001, 04:08:47 PM »

I would say you are right about the smaller hose ID being the problem. Pump designs are typicaly set up with a larger suction than discharge.
 You are likely pulling a high vacuum on the suction stroke when pumping. Just pump slower on the suction stroke. the fresh water always smells better after being gone from the boat for the week.
 Sanfrancisco Bay Sailin'
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