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The fuel pump relay for a 2003 Nissan Pathfinder is located in the main fuse box under the hood. Refer to the guide on the fuse box cover to easily locate the relay. If you're experiencing fuel pump issues, replacing the relay should be your first step. You can also try resetting the fuel pump by unplugging and reconnecting the relay, similar to a reset switch on older cars. If you continue to have no fuel pressure at the engine, it could indicate a pump problem. If replacing the relay doesn't solve the issue, then you may need to replace the pump itself.
It can be found in the trunk area, specifically on the left side panel. The relay should be to the right, connected with a blue wire with a red tracer.
The fuel pump relay for the 2003 Nissan Pathfinder is situated within the fuse box found in the engine compartment.