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In the 2010 Ford Focus, you'll find the fuel pump relay housed inside the engine bay on the driver's side, positioned against the back of the firewall. The relay should be connected on the left side of the box, while a 20 amp fuse that powers the fuel pump is located on the right side. This relay is essential for regulating the electrical supply to the fuel pump. Warning signs that it may need to be replaced include difficulties starting the engine, sudden stalling, or the fuel pump remaining silent when the key is turned to the "on" position. If the relay fails entirely, the engine may crank but not start since the pump isn't activated. In cases of intermittent failure, the car might stall at times but then start up again later.
In the 2010 Ford Focus, you can find the fuel pump relay in the main fuse box located in the engine bay, specifically positioned at the upper right corner of the fuse box.