I hope you are having a great day. For the issue regarding the pump to pulsate. It sounds like it is rapid cycling. To fix this issue you will need to make changes to the adjustment screw
.
  • Stand the sprayer upright and fill the sprayer with a bit of water. Turn it on.
  • Locate the microswitch housing (shaped like a "P") at the bottom of the pump.
  • Use a phillip's head screwdriver to tighten or loosen the adjustment screw (located between the two screws holding the microswitch housing in place) up to one full turn.
  • Activate the sprayer's trigger to test the response. Keep making adjustments until the trigger performs appropriately.

Please let me know if I can further assist.