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The best wAy to replace the fuel pump is yo take the truck bed off very simple 8 18 mm bolt you will also need to unscrew the gas hose and unplug the 2 rear lights under the bumper just follow the lines and unplug the 2 black ones the box is about 275 to 300 pounds so you will need help to remove it unless you get a couple saw horses a 3/4 piece if 8 foot plywood and some PVC piping to help you role it off takes about an hr to do this the fuel pump is simple just remove the cap with a screwdriver with a pushing motion take a picture of how the lines go to the fuel pump for reference and don't forget to change the fuel filter very important also

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11y ago
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Q: How do you replace fuel pump on 2003 GMC sierra 4x4?
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