Increase the M8 oil pump pressure relief pop off pressure with a Feuling spring. Our spring has the proper spring rate to control the pop off pressure and oil flow in the by pass port. This spring has increased pressure when compared to the stock spring, aiding seat pressure and increasing the overall pop off pressure. Repl. 26210-99. NOTE: Feuling oil pumps are pre set with the proper pop off and valve seal at the factory.