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A very common failure of the 6.7L Common Rail Cummins and Duramax 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. 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. Torque to 70 ft-lbs when installed.
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What's the difference between the $51.00 plug and the $ 31.00 you sell for the 6.7 cummins? There is only one pressure relief so why the 20 something dollar difference??
Different manufactures ask different prices for their products is the best answer I can give you on this. I will also add that they are all constructed identically.- TL
Is it safe to install a new fuel rail plug? From what I heard it isn’t due to the fact it “spikes” fuel pressure and I don’t know if that’s entirely true but I want to know if it is safe or not.?
We have sold these to people with stock to highly modified trucks and have had ZERO failures or issues with excessive rail pressure. -Ben
Is it safe to use on an entirely stock 6.7??
Yes it would be ok on a stock 6.7 truck. No issues there. If you are having low pressure issues, this is one of the least expensive things to check of course. But it could also be related to injectors, injection pump, or fuel supply to the injection pump. -Sands