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Message: [QUOTE="TARM, post: 68193, member: 578"] Ok that helps a lot. I am sorry I was not following your build and did not realize you did a full motor swap. Lots can certainly happen when doping that. Lets work the fuel pressure issue first and see if that fixes the other issues. Now if you start the truck and while running set the fuel pressure to say 65 psi. You then go for a drive and when you check it again it was reading 80 psi. Is that correct for one of the times? I think you also mention seeing it drop on you as well correct? I do not see that return line causing the issue. Unless it has something weird going on the old sending unit in the tank. If you can set the pressure at idle that return line is seeing the maximum flow return as the injectors are using the least amount. The pump is a constant flow or should be if functioning correctly. To rule on the return line for sure test to see how low you can drop pressure when at an idle. If you back out the set screw can you drop pressure below 60 50 40 30 how low can you take it. If you can drop it down well below your set point then its not your issue. If you can't then its could be the issue. But still I think you said you are seeing pressure drops as well so not sure its that. My first guess if the return line checks out would be a faulty regulator. [/QUOTE]

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