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Scann Tool used Snap On VERUS Originally went to check this truck with a DTC about high idle so Bring my old Snap On Vantage MT2400 to adjust the idle to spec wish is 1.0 volt to 0.7 volt ..so the truck was in spec...but engine running very bad.. so the next day I bring my fuel pressure gauge because with all the part been change...and bingo this truck have fuel problem as you can see in this video.. we are loosing fuel pressure in the system... and because the return line where is the fuel pressure regulator is a hard plastic we can`t line clamp that line...a fuel injector stuck open will bring the pressure down also..the one way check valve in the fuel pump can bring the fuel pressure down...so that`s way in the end of this video I say further diagnostic require...