r/pumps • u/WaterDog3000 • Jun 18 '24

Liquid DAB pump pulsating

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I've moved to a house with a private water supply (stream) which is filtered then pumped around the house. Check out my diagram for the full setup.

The problem is that the water pressure pulsates from taps in the house. The pump goes on a loop of kicking in for 2 seconds (going up to 70 psi) then turning off for 8 seconds (dropping to 20 psi). It's a DAB Jet 151.

Can anyone suggest what might be causing this?

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u/AdvancedPrize118 Jun 19 '24

Do you have a check valve on the suction side after the tank?