The fuel pump on a 2003 GMC Sierra is located inside the fuel tank. This is the single most important thing to know: you won't find it under the hood,...

The bottom line: The fuel pump on a 2003 GMC Sierra does not have a single fuse labeled specifically "fuel pump." Instead, the fuel pump is controlled through a relay...

The bottom line: If your 2003 GMC Sierra 2500 HD is experiencing hard starts, stalling, loss of power under load, or a whining noise coming from the fuel tank area,...