Skip the auto shop - Our mechanics make house calls

Q: Check Engine Light is on and I've noticed one minute my gas says a half a tank and the next it's at a quarter

asked by on

My check engine light came on recently and I just got my fuel pump replaced and thought I had everything under control. It came on again and now I really have no idea what could be going on other than something with the gas. Iv noticed that some times it will say it's at a certain point say a half a tank and I would shut the car off and turn it back on and it would be lower than that. I'm not really sure what could be going wrong with it. There's no sounds or anything coming from my car either.

My car has 112014 miles.

A: Hello. This is most likely a faulty fuel se...

Hello. This is most likely a faulty fuel sending unit. This is a unit that sits in the fuel tank that sends a signal relaying how much fuel is in the tank. These commonly go bad on many cars. If you need help having this looked at, a certified professional from YourMechanic can come to your car’s location to diagnose the Check Engine Light more thoroughly and perform repairs that are needed.

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: P0740 - Torque converter clutch malfunction.

Hi there. The torque converter clutch code has came on for the input shaft sensor has picked up a different speed when the engine is running. The clutch is slipping in and out of lock. Check the transmission fluid and...

Q: Unusual fuel drainage

The Volkswagen Golf has a fuel economy rated at 25 MPG City and 36 to 37 MPG Highway based on what transmission you have. These estimates are not void just because the engine has not broken. Since the vehicle is...

Q: Gas smell when gas needle is on empty - 1998 Oldsmobile Intrigue

There are many reasons that the smell of fuel may be present; however, this may suggest that you have a problem with your evaporative emissions system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...