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Make sure there's no air in the system. With diesel trucks, you can not have any air running through the fuel lines. Crack and bleed it and pump on the fuel pump (located usually on the side of the engine or on top of the fuel filter, depending on the truck) and keep pumping that out until there are no longer air bubbles coming out through where you've cracked it and there's just fuel coming out. Tighten where you've cracked it and bled it from, and try again.
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