Fuel Gauge Sender Unit Inspection

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Move the float to the topmost and bottommost positions, and verify that the resistance between terminals A and B of the unit and the position of the float are as indicated in the figure.
- If they are not as indicated, replace the fuel gauge sender unit.
  
  Fig 1: Checking Fuel Gauge Sender Resistance
  Courtesy of MAZDA MOTORS CORP.