Skip the auto shop - Our mechanics make house calls

Q: Faulty gas gauge or sending unit?

asked by on

I was driving down one night and my engine suddenly stalled. I initially ruled out lack of gas since my gas gauge says I still have over half a tank remaining. However, just to be sure, I put in some gas using a jerry can and yes, the car did start. So the tank was empty. At this point (having added only 5L of gas, as per the jerry can's capacity), the fuel gauge still said over half tank (same position as before my engine stalled).

I filled the tank up to full. The gas gauge went up, but not exactly "full".

Would this be a faulty gas gauge in the instrument cluster, or a faulty sending unit?

Thanks

My car is a 2001 Honda Civic Si with 205,000 kilometers.
My car has a manual transmission.

This is a problem likely related to your fuel tank sending unit. This is a small float type component inside your fuel tank that measures the level of the fuel inside the tank. As the fuel level drops, the float level changes and sends a signal to the car’s computer which then displays the reading on the fuel gauge in your dash. If you need assistance with this, I would recommend having an expert from YourMechanic come to your location to diagnose the issue and repair your fuel sending unit as necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Keeps dying and won't go past 20

A few different things can cause the engine to knock like this. The most likely would be low fuel pressure, the wrong octane gasoline, or an extreme misfire. I would not drive a vehicle that is knocking this badly as...

Q: I have a anti theft system installed in my car where you need to have the key in it before u can start the car.

Hi there. Check the battery cables and make sure that they are tight and clean. If you had replaced your battery, then with an aftermarket alarm, it is best to disable the alarm before hooking up a new battery. This...

Q: All electrical failure and buzzing under steering column. Slammed on the brake and it stopped and car started. Had to reset clock

You have a bad connection at a main power point. The buzzing under the steering column is a relay that is clicking on and off very rapidly. This is normal when total electrical power is lost. Stomping on the brake...

Related articles

P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.