Why does it still show no fuel after filling up?

[LeLydia]

When the fuel gauge still shows empty after filling up, it is usually caused by a malfunction in the fuel level sensor inside the fuel tank. Below is relevant information about the fuel level sensor: 1. Working principle: The sensing part of the fuel level sensor is a coaxial container. When fuel enters the container, it causes a change in capacitance between the sensor housing and the sensing electrode. This change is converted by the circuit with precise linear and temperature compensation, outputting a 4-20mA standard signal to the display instrument. 2. Meaning: The fuel level sensor detects the position (height) of fuel in the container by utilizing the capacitance change between the sensor housing and the sensing electrode when fuel enters, and converts this change into a current variation.

[VonMicah]

Buddy, I've personally experienced this issue before. Last time, I filled up the tank but the fuel gauge showed empty, which really freaked me out. Turned out the fuel float inside the tank was stuck, probably due to debris at the bottom. Later at the repair shop, the mechanic opened it up and found the float mechanism had rusted and become sluggish—had to replace it with a new one. He also mentioned common causes include aging sensor wires or poor contact, especially during rainy weather when problems are more likely to occur. If this happens right after refueling, try turning the car off and restarting the ignition—sometimes the system can reset after a power cycle. But the scary part is not knowing if you're actually running out of fuel on the road—that's dangerous. My advice: don't delay, take it to a professional shop and have them scan it with a diagnostic tool. It'll cost around a hundred or two to fix. Always use quality fuel and avoid rough roads to minimize vibrations and prevent internal tank damage. Oh, and I've also had a dashboard malfunction before—unrelated to fuel—just a display module glitch. Easy to fix, but don't overlook the details.

[McKatherine]

The fuel gauge still shows empty after refueling, which is usually caused by a faulty fuel level sensor. Possible reasons include a deformed float arm or oil residue jamming, leading to incorrect signals sent to the dashboard. I've seen many cases where a short circuit or poor grounding in the car's electrical system caused this issue—most commonly a blown fuse. First, check the car's fuse box for the small fuse corresponding to the fuel gauge. If the wiring is loose or the connector is corroded, it may send erratic signals. Additionally, the tank might not actually be full—misreading can occur if the fuel nozzle isn't inserted properly or due to pressure differences. Don't panic if this happens; DIY checks can be cumbersome. It's best to have a technician use a multimeter to measure voltage and confirm the issue. Replacing the faulty part is cost-effective and ensures safe driving. Newer cars have fewer issues, but modern systems are more sensitive—a minor glitch can trigger a warning light. Remember to address it promptly to avoid being stranded on the road.

[AlanaRose]

Erratic fuel gauge readings are typically caused by sensor or wiring issues. I once encountered a situation where the needle didn't budge after refueling, and later learned it was due to a stuck float or sludge buildup. Sometimes fuses blow, especially during circuit overloads. For DIY troubleshooting, try turning off the ignition and waiting five minutes before restarting the system. If that doesn't work, head straight to a repair shop. Don't underestimate this issue - it poses significant nighttime driving risks. Visit a professional facility for prompt repair to avoid recurring problems.