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A very common failure of the 5.9L Common Rail Cummins is that of the pressure relief valve. These relief valves are a simple spring that is designed to relieve pressure as it exceeds a predetermined pressure, typically around 27,000psi. Unfortunately, as pressure is continually applied to this spring, it fatigues and does not have the ability to maintain even stock pressures. Now, throw pressure boxes and other power adders into the mix that demand higher rail pressure, and this spring further fatigues, causing you to lose valuable rail pressure.
This Rail Plug easily installs into the factory rail and eliminates the troublesome pressure relief valve to ensure you're getting the commanded rail pressure of your CP3 all the way to your injectors.
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I have read on a few different sites that using a common rail fuel plug can cause fuel system damage. Possibly damage the injector nozzles themselves. Looking over your recipes for horsepower for the 03 to 07 cummins i see this plug listed quite a bit. I have a 2006 2500 5.9 and as far as I know the fuel system is all stock. Right now I have everything listed on your recipe for 400 horsepower except for this fuel plug. I don't drive my truck super hard all the time, and I am not getting any codes. Would I really benefit from this plug if I don't seem to be having any issues? Occasionally I will get a hard start in the mornings and have to turn it over twice to get it to start, or hold the key while it cranks over a little extra before starting. Curious to hear your input. Thank you?
If you are not getting any codes and your rail pressure is not dropping there is no reason to plug it. As long as you have something to monitor rail pressure there is no issue running a plug.