Skip the auto shop - Our mechanics make house calls

Q: Gas topping off at four gallons

asked by on

When I put gas in my car, it stops after only putting in about four gallons of gas.

A: When filling up your gas tank, it is import...

When filling up your gas tank, it is important for the health of your vehicle not to top of your tank. The gas pump will shut off automatically after the tank is full to a desired point. If topped off the extra fuel can go into your charcoal canister which is apart of the fuel system used to recycle unused fuel vapors. Once a charcoal canister is damaged its can cause the issue you are experiencing with your vehicle, not being able to fill up constantly without it falsely shutting the pump off. A proper inspection of your EVAP system should be carried out by a qualified technician like the ones we offer here at YourMechanic. They will be able to let you know what repairs need to be made.

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

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: Car won't start after cleaning battery

The battery terminal connections should be inspected since they were serviced recently. These are often left loose, or even applied too tightly. Allow me to explain: Some people tend to turn the securing fasteners on batteries until they cannot...

Q: I dropped a plastic object in my gas tank. It's about 25 cm long. What will happen and what should I do???

Hi there. The effect that this object will have on your vehicle depends on its size. If it is not flat and somewhat irregular, then you should be fine if you leave it in there as it should not interfere...

Q: Power door locks won't open

If the door latch lock cylinder is not unlocking the latch, then the inside door panel would have to be removed in order to access the latch and try and open it; this would be the only way to open...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...