2021 337rls with Sureflow water pump 4008-101-a65. Water pump was shuttering and pulsating. I figured there was an adjustment for the pump. These pumps use a pressure sensitive switch to turn the pump on and off. The sensitivity of that switch is adjustable. There is a very fine line between under adjustment (pulsates), adjusted properly, and over adjusted (pump won't turn off). After doing a little research I used the following link to adjust my pressure sensitive switch
I had to turn my set screw about 1/3 of a turn clockwise. Now the water pump works as it should. Gives a much smoother flow with no pulsating. At 1/2 turn the pump wouldn't shut off so I backed the adjustment down to 1/3 of a turn. Super easy fix. You just need to get to the front of your pump and have a tiny alen wrench to make the adjustment.
I had to turn my set screw about 1/3 of a turn clockwise. Now the water pump works as it should. Gives a much smoother flow with no pulsating. At 1/2 turn the pump wouldn't shut off so I backed the adjustment down to 1/3 of a turn. Super easy fix. You just need to get to the front of your pump and have a tiny alen wrench to make the adjustment.
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