I installed a new holley 12-150 billet fuel pump. It it rated at a 12psi output and requires a reg which was included. The pump sounds like it is pulsating and the -8 line on the output is pulsating with the sound of the pump. I put a pressure gauge at the inlet of the reg and the output. The output is rock steady 7psi but the input pulsates quickly from 10psi to 16psi.Should this pump have a steady pressure output? It's pulsating like a mechanical pump.Holley said it's normal but I am not convinced.