Why does the fuel gauge show empty after refueling?
2 Answers
Possible reasons include: instrument damage, wiring issues, or fuel level sensor failure. First, check whether the power and ground wires of the fuel level sensor are functioning properly. If not, inspect the wiring. If they are functioning properly, remove the fuel level sensor and manually move it up and down. If it moves, the fuel level sensor is damaged. If it doesn't move, check the fuel gauge. Specific steps are as follows: 1. Replace the fuel level sensor: Turn the ignition key on and off again. If this doesn't work, try driving for a while and check again. If the issue persists after driving, it is recommended to replace the fuel level sensor. 2. Slow fuel return: Some vehicles have a slower fuel gauge response. It may take five or six minutes for the gauge to return to the correct level, which is mainly due to the difference between electronic and mechanical systems.
I've seen this a lot! The most common reason for showing no fuel right after filling up is a stuck fuel float in the tank. That thing is connected to a thin rod floating on the fuel surface. Sometimes when there's too much debris in the fuel or the tank bottom is deformed, the rod gets stuck at the lowest position and can't move. Turn off the engine, turn the key to the accessory position without starting, wait ten seconds or so - sometimes the system reset can fix it. If it still doesn't change after driving a few kilometers, you need to check if the fuel level sensor wiring in the fuel pump assembly has water damage or oxidation. Older cars are especially prone to this issue. I recommend noting the fuel gauge position before refueling and comparing it immediately after filling up - that's the most straightforward way to check.
