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I'm working on a 2020 f350 6.7l, with a family member who ran it dry. We put in a diesel to to give it a quarter tank. Replaced the fuel filters to see the condition and hope it would help it start. When I check the pressures for the high at KOEO it reads just over 3000psi, the low side reads just over 30psi. When cranking the high side reads just over 5000psi and low side at around 73 psi. We were able to start it for a few seconds before it cut out and haven't been able to get it to completely start. We've visually checked fuel flow to the HPFP and it is present. I don't believe it the HPFP that has gone bad with just under 45000 miles. P2291 is pending and a P0087 is permanent because a roadside service guy loosened the line fitting to two injectors and didn't tighten them up. I checked all line fitting for tightness to be sure none are loose. Any ideas where or what to check before taking the intakes off to check the HPFP?