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What is the pressure coming off the low side pump? What about aeration? Have you tested for that? I see this code a lot when there is a lot of air in the system.
I have also seen this be caused by bad injectors as well. I would remove the valve covers, test for leaks, and if that passes, remove the injectors and have them tested. If one is bad, from a small piece of metal from the fuel pump, it will throw this code. You can still have high return pressure and have bad injectors.
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