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2004.5-2010 6.6L DURAMAX DIESEL FUEL RAIL PLUG Replaces stock or a shimmed pressure relief valve. This valvehelps maintain fuel rail pressure during full throttle driving by completelyblocking the pressure relief port (effectively deadheading the fuel rail). It eliminates low fuel rail pressure DTC codes P1093 or P0087 (low fuel railpressure during power enrichment) that are caused by insufficient PRV springpressure
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