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Message: [QUOTE="Dzchey21, post: 791704, member: 63"] generally speaking on a common rail system the low pressure system is pretty low pressure. I think cp3s are the happiest around 15psi but i have seen guys push about 50 to try and make a single stock pump or dual fuelers push the limit of maintaining rail pressure. That being said i can only see a few reasons that the low pressure system would need to be cranked up that high the system cant maintain pressure with out it the system will maintain but generate more heat and wear from the HPFP 29k rail pressure is harder to make then what im thinking it should the cp4 doesnt have much or any of a low pressure pump built in like a cp3 or a 6.4 pump. Judging by the size of a cp4 it must not have much... On dual fuelers esp with not an extremely large nozzle you dont need the low pressure system to generate crazy psi to get the hpfp to maintain. unless.... the injector can match the flow of two pumps. Meaning at the right pw and pressure 2 pumps is just enough to maintain, Where on 6.4s 2 pumps will maintain exactly 2x the injector nozzle size. Again this is possible im not super familiar with the 6.7 system Easy button= two factory fuel pump systems, one feeding each pump or using the factory pump to maintain the stock pump and a fass or something feeding the cp3 i dont know how happy a cp3 will be with 75 psi i know 6.4 pumps don't and will not take more than 15 for very long without pushing the seal out of the pump and filling the crankcase with fuel [/QUOTE]

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