coldlight sourceto excludemethods:firstwater pressureup, and thenpumpfilled with water, and thenboot.coldlight sourceat the same timecheck thecheck valveistight,piping, fittingsorwithoutair leaks,andfoundtheleak.coldlight sourcedemolishedin thejointscoated withoil orblendingpaint,and tighten the screws. coldthe lightsourcebecause oftheair orthe inletgas accumulation, ortheend of the valvein the pump bodylaxofftheirrigation waterdissatisfaction,aseriousleakofthevacuum pumppacking,gate ordoorclosed lax.