Fuel Gauge Unit Inspection

To check the fuel gauge unit, remove it from the fuel tank.

Fuel Gauge Unit Float Height:

Fuel Gauge Unit Float Height
Move the float and measure the height A at point F (highest) and B at point E (lowest) with float arm touching stopper.
Standard value:
A: 28.6 mm (1.13 in.)
B: 159.9 mm (6.3 in.)

Fuel Gauge Unit Resistance:

Fuel Gauge Unit Resistance
1. Check that resistance value between the fuel gauge terminal and ground terminal is at standard value when the fuel gauge unit float is at point F (highest) and point E (lowest).
Standard value:
POINT F: 4 ± 2 Ohms
POINT E: 112 ± 7 Ohms
2. Check that resistance value changes smoothly when the float moves slowly between point F (highest) and point E (lowest.)

Thermistor:

Thermistor
1. Connect fuel gauge unit to battery via test light (12 V - 3.4 W). Immerse it in water.
2. The condition is good if light goes off when thermistor or level switch is in water and lights when it is removed from water.

CAUTION: Dry the unit, or water will get into the fuel tank.