Pulsing Fresh Water

[play dough]

Opened up the boat today. The cold water at the sinks pulse rapidly to the "beat" of the fresh water pump. I don't recall that being the case before. The hot has a nice constant flow. I'm guessing that may be because the pulse is dampened by the hot water tank. I had some electrical issues with the pump in the past so with this event put in a new pump that I had purchased last year (Shurflo). What's causing the pulsing? Boat is '89 300DA.

 

[IanBat]

Mine does it if I don't turn the tap on far enough


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[play dough]

Must have been some air in the lines or something that caused it. It is much more steady after a day of usage.

 

[Mikemapva]

Mine does that when the tank is low also.

Mike

 

[go2pamlico]

Check the plastic inlet filter cover for a hairline crack. This can cause pulsing as you described.

 

[E-man]

One more vote for low water level in tank.

 

[AKBASSKING]

On the pump there should be two screws, one is for the pressure switch and the other is for setting the bypass. They are (at least on my shurflow pump) are allen screws.

 

[JV II]

I second the vote on on the pump pressure screw adjustment. If your tank is full and you have no leak, then the pump needs to be adjusted a little. Let us know.

 

[E-man]

Which screw do you adjust and how much? Is there an adjustment procedure for this?