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In a 2003 Ford Ranger with the 3.0L engine, you can find the fuel pump relay inside the main power distribution panel located in the engine compartment. This relay is responsible for transferring power from the battery to the fuel pump. If you're experiencing issues with the fuel pump, your first step should be to remove and replace the relay. This simple action usually helps reset the pump and can potentially resolve many problems. However, if installing a new relay doesn't solve the issues, it may be necessary to replace the fuel pump itself as it could be failing. A failing fuel pump can cause a decrease in pressure at the engine and result in stalling.
In a 2003 Ford Ranger 3.0, you can find the fuel pump relay housed within the fuse box situated inside the engine compartment.