You'd better check the pressure-flowrate profile. $ W! L0 a7 j* p2 D1 N OMoreover, you didn't say what kind of pump you used1 m( z9 C1 F' p
, o) m# x( ?( cif for variable displacement pump or others 9 w: M y5 Z' ^( F5 n; O1 l$ s: c fOnce you change your device to 45cc then the deadhead pressure changes: f& z2 T; w* h5 g9 p/ m