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・Save up to 30%

Get a quote

What others are asking

Q: Engine noise, RPM fluctuation, ABS, 4x4 warning on

Hello. It sounds like you have a problem with the DME (digital motor electronics) and the ECU (engine control unit). It would not be a mistake to have these two things replaced. It is an expensive repair but I’m confident...

Q: How Does the Fuel Pump Know When to Shut Off?

The are two main components that make most fuel pumps run: the PCM (Powertrain Control Module) and the fuel pump relay. Fuel pumps themselves don’t know when to shut off. They are entirely dependant on the fuel pump relay to...

Q: Gas gauge not working

The gas "level" gauge relies on a sending unit in the fuel tank. You'll want to first confirm that the fuse in the circuit is in place and has continuity. If there is no issue there, the sending unit is...

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.