theres very little that can go wrong with a fpr as its a very simple design just a valve that regulates the fuel pressure from the pump via a diaphragm, generally knock offs either leak or have inferior parts used ie the diaphragm but as said this is the Chinese sard knock offs etc always buy from a genuine sard dealer rather than ebay as the fakes are getting harder to spot and you can never be 100% sure its genuine, just my opinion Just to show im not bullshitting anybody top left of the pic this was my setup 18months ago