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There is a new fuel pressure regulator available for the 6.0, 3C3Z-9T517-AG. It comes with a blue spring and bumps fuel pressure to around 70psi, 50-55psi with the test tool (as mentioned in the above post) valve open. Hope this is of some use to you. Typically I will put a small ball bearing under the spring, or put a different spring in it should I be able to find one that fits well and doesn't put the pressure through the roof.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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