Fuel Gauge Fluctuates, Indicates Wrong Value, or Varies

Test drive vehicle to see if gauge fluctuates only during driving or at the instant of stopping.

Does the indication value vary only during driving or at the at the instant of stopping? 

YES: The gauge fluctuation may be caused by fuel level change in the fuel tank. Condition is normal.

NO: Ask the customer about the situation when the symptom occurs in detail, and perform the trouble diagnosis.