S90 & V90
- Disconnect negative battery cable. Disconnect fuel level sensor connector and measure resistance between Gray/White and Brown wires. Resistance should be 0-280 ohms (15-gallon tank) or 0-367.5 ohms (21-gallon tank). If resistance is not as specified, replace fuel level sensor. See FUEL LEVEL SENSOR under REMOVAL & INSTALLATION.
- Add 2 1/2 gallons (9L) of fuel to tank. Resistance should increase 5 ohms each 1/4 gallon (1L). If resistance does not increase as specified, replace fuel level sensor.