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

asked by on September 15, 2016

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.

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

I hooked jumper cables up backwards now my truck won't fire off without spraying starter fluid

Determine if the fuel pump is actually running. The fuel pump should run momentarily at key on to pressurize the system. If it isn't running, you have an electrical problem. If the pump runs momentarily as is required at key...

Truck bogs out under load

First, the EGR tube rusted away will cause excessive air to get into the exhaust and cause the O2 sensors to read erratic. The main reason you most likely have a mass air sensor that is not reading correctly for...

Hi so my car is idling low when stopped even stalled out at light. Also when driving whether accelerating or at constant speed eng

Hello, thank you for writing in. Typically issues like this stem from an issue with an air intake sensor, spark problem, or similar malfunction. Even without a check engine light on, you can still scan the vehicle for diagnostic codes....

I need to replace my catalytic converter and I wanted to see what are the main parts I will need to buy that comes with it?

The parts required to change out a catalytic convertor will really depend on what type of converter is going to be used. There are factory type replacements that will use a flange and just get bolted into place, that will...

No start

You need to check for battery voltage on the red wire to the coil with the key in the on position and then check the same wire when you go to the crank position. If either one is not as...

Can a leaky CV axle seal ruin a CV axle?

The oil leak itself may not necessarily ruin the CV axle, however if the oil leak progresses to a point where the CV joint lacks the proper amount of oil to sufficiently lubricate it, the lack of lubrication can cause...

Rear running lights don't work

Hello. If just your tail and license plate lights are not working, I would first check to see if any fuses are blown. It may be possible that both of those exterior lights are on the same circuit, and the...

Stalling fuel pump flapper on 1994 Ford Probe

Hello. The fuel pump on your vehicle is powered through the fuel pump relay through direct battery power. The fuel pump itself is located in the fuel tank and there is not an access panel to easily change it. The...

How do I turn on the dome lights?

The dome lights provide light to the interior of your vehicle. To turn on the dome lights, press the Dome Lamp button. Press this button again to turn off the lights.

Related articles

A Buyer’s Guide to the 2011 Lincoln Town Car
2011 2011 marked the final year for Lincoln’s aging Town Car. It offered an immense amount of space in the front and the rear, as well as the iconic style for which the line was known. Key Features Perhaps...
2012 Hyundai Elantra vs. 2012 Ford Focus: Which One Should I Buy?
The Hyundai Elantra and the Ford Focus are both offerings in the inexpensive compact sedan category, and both represent some of the best offerings in that class. Compact cars are slightly larger than a subcompact, but smaller than a mid-size;...
The Best Used Cars to Buy for Dog Owners
Dog Dog owners are a special breed of drivers. When they shop for a used car they have a list of requirements that can be quite different from other drivers, which tends to make the process a bit of a...