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Old 12-24-2007, 09:01 AM   #1
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fresh water tank level and pumping

It seems I have to fill my fresh water tank more than half full to get the water pump to start sucking it up. Once there is water in the system it seems to pump out the tank OK. It's a new pump. Why do I need this much water in the tank to get the system pumping? Could there be a loose feed line in the tank?
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Old 12-24-2007, 09:18 AM   #2
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How is the flow after it gets primed? Low? There is likely a clogged screen in the suction side.
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Old 12-24-2007, 09:23 AM   #3
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Quote:
Originally Posted by thecatsandi
How is the flow after it gets primed? Low? There is likely a clogged screen in the suction side.
Once primed it's fine. Also I should add this coach sat for about 20 years unused until last year.
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Old 12-24-2007, 09:37 AM   #4
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is it a new fresh waster tank? could there be crud in there that is somehow clogging the water pump?
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Old 12-24-2007, 11:17 AM   #5
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Sounds like it has trouble priming. Usually caused by insufficient lift at the pump and may be related to a leaky valve that can't seal well in air but is still OK for water. Check out the (that's why we call 'em) check valves–they should seal airtight.
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Old 12-24-2007, 11:35 AM   #6
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Holding prime

Does it empty the tank once it starts pumping? Does the tank hold pressure once it is pressurized? It may have some trouble holding the initial prime due to a small air bubble in the line. Only by adding higher water level to the tank is the bubble replaced by water allowing the pump to prime properly and continue to pull water from the tank. Once the vacuum pressure is lost, after the pump is shut off and the water level is low, an air bubble is reformed in the line and won't allow the pump to prime itself again. You may want to fill and pressurize the tank and find out if there is a small leak (allowing air in under normal operating conditions). This would also need to be done to check the line from the tank to the pump. If these both check out it could be a bad pump gasket or diaphram allowing air to enter the pump and line once the vacuum is lost when the pump turns off. Remember loss of pressure from either end can cause this problem. Hope this helps. Happy Trails, Ed
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Old 12-24-2007, 02:08 PM   #7
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To answer some of the above questions:
1. As far as I know the tank is the original 1971
2. Where are the check valves? It looks to me like the water pump inlet line goes directly into the bottom of the tank.
3. This is not a pressurized tank as far as I know.

So far my guess is a clogged screen or crud in the tank. Is there an easy fix?
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Old 12-24-2007, 06:30 PM   #8
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Check valves are in the pump. One for the inlet one for the outlet
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Old 12-24-2007, 06:51 PM   #9
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Quote:
Originally Posted by Lumatic
To answer some of the above questions:

So far my guess is a clogged screen or crud in the tank. Is there an easy fix?
Remove the hose from suction side of the pump open the fill cap. Put the the air compressor blow gn on the end of the hose with about 25 PSI and let her rip for a few seconds.
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