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Assuming you mean the fuel line, the system has an electric pump. With the bleeder valve open on top of the fuel filter, cycle the ignition key on and off (no need to crank the starter) several times (pausing briefly in the on position) until fuel comes out of the bleeder valve. Close bleeder valve and start the engine.

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Q: How do you prime the gas line in a gmc 3500 6.2 diesel?
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