Back to the boat after a week and I turn on the house fresh water pump panel switch and it is pulsing in and off for short intervals ( less then 1/2 second ) . I can feel the motor on the pump and definitely turning over . Usually it doesn’t come on until I run water in the sink or maybe it comes on once briefly to pressurize the system when it first turns on . When I turn in the sink , the pump then pumps normally ( but will pulse again when you turn it off ) . The pump was replaced about 5 months ago by the diesel mechanic when he serviced my engine. Pump is the popular Sureflow Aqua King . I’m working wondering what is going on ? First thought is maybe there a leak somewhere but can’t find an obvious one .