Abstract: Check valve testing systems and leak detection methods using the same are disclosed. In embodiments the check valve testing system includes a check valve assembly and a pressure sensor. The check valve assembly includes a first pressure zone upstream of the check valve and a second pressure zone downstream of the check valve. An inlet valve and a drain valve may be fluidly coupled to the first pressure zone, an outlet valve may be fluidly coupled to the second pressure zone. The pressure sensor is configured to detect a fluid pressure in the second pressure zone. The controller is configured to communicatively couple to the pressure sensor, and is configured to determine whether there is a leak through the check valve, a leak downstream of then outlet valve, or a leak through the outlet valve when the inlet valve, drain valve, and outlet valve are in various conditions.