Skip the auto shop - Our mechanics make house calls

Q: Fuel gauge dropped dramatically and the gas tank looked like it was suctioned in because of a vacuum

asked by on

While driving my truck at highway speeds, I noticed that the fuel gauge started to drop very quickly, almost half a tank in about 7 miles. The engine seemed to be running fine, no sputtering of anything. I pulled over to check if it was leaking fuel when I noticed that the fuel tank itself had suctioned inward as if there was a vacuum being put on it. I opened the fuel filler door and depressed the little door inside the neck which let air back into the tank and caused it to look normal again? Any ideas?
My car has an automatic transmission.

A: Hi there, thanks for writing in your questi...

Hi there, thanks for writing in your question and the details of your situation. Based off your information, I’d like to mention that the fuel fill tube has a fresh air inlet that should prevent this from happening. Either an inlet valve may be damaged, or a the fuel fill tube is defective. I’d recommend having one of our certified mechanics inspect the fuel fill tube to see if it is binding and needs replaced.

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: How do I adjust the remote start rear defrost?

When the remote start rear defrost is turned on, the rear defroster will begin operating when the engine is turned on via remote start. To turn this feature on or off, follow these steps: 1. Press the Up/Down buttons on...

Q: Broken heater

If everything in the cooling system has been eliminated as a cause - coolant level, flow, thermostat operating properly, etc., the issue may lie with the heater controls inside the vehicle. Within the "heater box" under the dash is located...

Q: A/C Constantly Blows On Feet When A/C Is Off.

Hello there. It's difficult for us to give you an accurate assessment on what might be causing your AC issues on the Dodge Nitro since we're not sure what you may have removed in order to replace the blower motor....

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...
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.