S&S Pressure Relief Valves

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Fuel Pressure relief valve, LB7/5.9 style, stock replacement 1850bar single stage, M18x15.

Single stage VS dual stage relief valves? Single stage relief valves will open above their set pressure and close below it, stock LB7/5.9 valves are single stage and good for racing applications. A dual stage relief valve functions the same as the factory LBZ/6.7 ones where once they reach their set pressure and pop open, they will remain open until a much lower pressure is attained or the engine is shut off, this creates a reduced power / limp home condition, good for street or towing applications.