Fresh water system

E

erice

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Jan 4, 2012
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32840
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84
It seems that every time I switch f w tanks, it takes forever to get the diaphragm pump, new or old, to prime and pump properly. I've replaced the pump, lines, primary and secondary filters this year. The only part I've not changed is the 3 way valve. Could that be sucking air?
 
quote:
Originally posted by erice

It seems that every time I switch f w tanks, it takes forever to get the diaphragm pump, new or old, to prime and pump properly. I've replaced the pump, lines, primary and secondary filters this year. The only part I've not changed is the 3 way valve. Could that be sucking air?
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Sure, why not?

Since there's only one part left to change, you might as well change it.

I have found that simply replacing parts until the problem is solved is not the most efficient way of troubleshooting.

The other way is to examine the system, think about what might be causing the problem and then do some testing. Your description of your system doesn't include enough information for someone to make a diagnosis.
 
Possible, when you switch tanks, the valve should seal the unused line preventing water from back flowing in the tank and pump should not need any time to prime when you switch back. If water doesn't stay in the line you have a leak, either the fitting or the valve
 
Why have a switch at all. Boats with 2 tanks I thought just pull from both and they balance automatically based on demand. Pull the switch out and put in a Tee.

A good way to diagnos a fresh water system is using a CAP. I bought a cap with a small piece of pipe. I pull off a pipe say right after the pump, cap it, pressurize. If it doesn't pressurize, leak is before pump or the pump.

Then move up the line from there and cap where needed to isolate the part of the system that may be leaking.
In my case it was before pump and turned out the filter was not seated right.
 
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