Any ideas why my pressure at the pump gauge registers about 5-7 psi higher than at the filter? Clean filter, pressure at the pump is 15 psi and at the filter is 10psi. The plumbing goes from pump output 6" to a 3-way valve (to bypass filter as necessary). From valve goes to HIgh-Flow valve of Pentair Quad 100 filter.
Is it possible that the 3-way valve in close proximity to the pump output (6") is creating additional pressure? The reason I am concerned is because I am experiencing priming problems when the pump has not run for about 14 hours. When it starts, sometimes it does not prime. My vaccum (suction side) is about 5 and already checked the lines and no obstructions. According to Pentair, the filter pressure should not be lower than the pressure measured at the pump. Already changed gauges. Once it is running, I get 50 GMP with 2350 rpm.
Any ideas are appreciated. Thanks.