5. Detect Malfunctioning Part

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Check the following.

Harness connectors B1, M11
Harness for open or short between "fuel level sensor unit and fuel pump" and "unified meter and A/C amp."
1. Repair open circuit or short to ground or short to power in harness or connector.