One of the most prevalent issues we see causing hard starts, lack of power, and poor fuel economy, is that of a blown or weak pressure relief valve. The pressure relief valve is a simple....you guessed it....relief valve located in your fuel rail designed to limit rail pressure to avoid damage to your injectors. Once it "sees" enough rail pressure, it will bleed off and return the fuel back to the injection pump to be recycled back into the system. Because this is a simple spring valve, it will lose its memory and begin to start bleeding off prematurely, not allowing the rail to build adequate pressure, in turn meaning the injectors are not getting adequate pressure. Many will take the option to simply block off the relief valve, which definitely works, but it does mean that you are removing a built-in safe guard from the factory. If you're like many and would prefer to reinstall a fresh relief valve, check out this genuine Bosch unit for years of trouble free service.
Genuine Bosch Pressure Relief Valve (PRV)
Cross ReferenceOEM Number(s): Cummins: 3947799 Reference Number(s): Bosch: 1110010029 F00R000632
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