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In the 2005 Ford Mustang, the fuel pump relay can be found in the engine bay under the hood within the "Bussed Electrical Center" fuse box. This relay, identified as #21 at the far end of the box, is essential in controlling the fuel pump with the Mustang's computer. Warning signs of a failing relay or fuel delivery system include engine stuttering, sluggish acceleration, poor fuel efficiency, power loss, starting difficulties, and decreased fuel pressure along the rail. Replacing the relay itself costs under $20 and is a task that the owner can easily accomplish. However, if the entire assembly needs replacing, the parts and labor can run between $700 to $900.
The fuel pump relay for a 2005 Ford Mustang can be found inside the fuse box located in the engine compartment.