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773 Posts
I bought the Sinister Diesel kit and located my sending unit over close to the driver side batt. My pressure still runs 71-72 @ idle. I was slightly concerned at first, but the more I looked into it the better I felt about it. Ford actually says that 70-75psi @ idle is a high but acceptable pressure. If my pressure would have been at 75psi @ idle I'd have taken action and ground the spring a little, but I feel fine were my truck currently sits. If there are guys out there runnin' the GDS spring with 95-100psi on the injectors without any issues, a tad over 70psi can't be doin' any harm IMO.