Believe me, I have tried to save money before buying USED or Autozone(Sore en sen) FPR before and they just get weak (low PSI on gauge) within a few months. Try and get one from Courtesy Nissan and they will last many years. Yeah, I am verified. Do the test with pinching pliers (long-nosed type vise-grips) and make sure a new check valve will do the trick for your car. "Good luck is for fisherman." Norm K.