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Fuel Pump Relay


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2007 NBS Sierra 5.3L - I'm planning to take my fuel injectors out to clean them and wanted to first relieve the pressure in the fuel system. I started the engine and pulled the fuel pump relay thinking that the engine should quickly run out of gas. It didn't - I waited several minutes but not even a sputter. I'm pulling fuse #21 in the attached diagram - thoughts?

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