Skip the auto shop - Our mechanics make house calls

Q: Why am I losing a half of a tank of gas in 24 hours?

asked by on

I have had my fuel pump replaced twice in my car. Yesterday 12/08/2016 I had filled up my car between yesterday and today I have lost almost a half of a tank of gas. I also have a check engine light on and confirmed by 3 different mechanics that I have a bad thermostat. My am I losing a half of a tank of gas with-in a 24 hour time span?

My car has 100000 miles.
My car has an automatic transmission.

This is a problem likely related to your fuel tank sending unit and is unrelated to the faulty thermostat. 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. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your fuel sending unit.

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!
  1. Home
  2. Questions
  3. Why am I losing a half of a tank of gas in 24 hours?

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: 2000 Xterra

Code P1320 is an ignition fault. Its is likely caused by a failed ignition coil or power transistor. The transistor receives a 12 volt signal when the key is on, then signals the ignition coil to fire each cylinder. If...

Q: Creaking noise upon releasing the clutch

Hello. This is usually caused by either a worn out engine or transmission mount or an issue with a worn out suspension bushing. Either one will allow parts to move when they should be stationary and will cause this noise...

Q: Had A exhaust cat front converter gasket blow when i was driving got louder and louder satarteded to looose power the next day i

Hi there. From the description you have provided, sounds like, the problem is the catalytic converter. The exhaust leak gave the engine the ability to breathe out. If the engine can't breathe out, it can't breathe in. By sealing the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.