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Gas Cap

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Symptoms of a Bad or Failing Fuel Filler Cap
Common signs include the cap not tightening properly, a fuel smell in the car, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Gas Cap
Common signs include the cap not tightening properly, a fuel smell in the car, and the Check Engine Light coming on.
How Long Does a Gas Cap Last?
The fuel that resides in your gas tank is used to power your vehicle and to supply the material needed for the combustion process. Making sure that the gas in the tank...
How to Replace a Fuel Filler Cap
A good fuel filler cap safely seals the fuel tank. Signs of a failing fuel cap include the smell of gas, stripped threads, or a cracked cap.
Can a Loose Gas Cap Let Gas Leak Out of the Fuel Tank?
The short answer is: yes ... kind of. What escapes out of a loose or faulty gas cap is gas vapor. Gas vapor rises off of the pool of gasoline in the...
How To Install a Locking Gas Cap
Gas caps are necessary for proper gas tank function. Overtime, a gas cap can fail if the thread gets damaged or if there is a leak in the seal.
Is It Safe to Drive With the Gas Cap Light On?
You have what sometimes seems like innumerable warning lights in your vehicle. Some of them alert you to very serious problems. Others, not so much. Some lights simply provide information, and your Gas...

Related questions

Question
2014 Toyota Corolla Fuel Odor
This may be related to the fuel tank purging system. As you may know, all modern cars are equipped with an Evaporative Emission Control (EVAP) system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the...
Question
My truck started to vibrate, lose power, etc.
Hi. When your Check Engine Light is blinking during acceleration, this usually means that the engine is misfiring in more than one cylinder of the engine. The by the engine misfiring, it causes the computer to adjust how the engine...
Question
Check Engine Light stays on.
Hi there You should have the computer Check Engine Light scanned by a mechanic. Once the codes are received and the pinpoint test is completed, you should have a diagnosis of the failed component. A lot of times a code...
Question
Cables that unlatch and unlock tailgate have rusted out, and I do not have a way to get into the trunk.
Hi there, thanks for writing in. Most truck lock cylinders can only be accessed by removing the rear seats, the trunk cover and crawling inside the trunk or contacting a locksmith to unlock the trunk from the outside. As far...
Question
Check engine light is on with code P0440. Also the car makes noise
Hi there, thanks for writing in. This code is for a leak or failure in the evap emissions system. By far the most common cause of this is a bad gas cap. If the seal on the cap is bad...
Question
Codes P0171 and P0442 - is it a gas cap issue?
Hello. These "small leak" codes can be very frustrating! Both of these codes (P0171 - lean condition, P0442 - small evaporation system leak) are the result of an air leak in the engine's air intake system. Causes can be leaks...
Question
Gascap warning on 2007 Caravan
For the first issue, the gas cap will need to be replaced sometimes. I had a 2009 Dodge Charger that this happened to also. It's not something you can control. As for the second issue, it seems like it is...
Question
My car has a evap leak and poor performance
All modern cars are equipped with an Evaporative Emission Control (EVAP) system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal...
Question
Why does it do this??
All modern cars are equipped with an Evaporative Emission Control (EVAP) system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal...
Question
Bike switches off while driving
Depending on the type of fuel valve you have you should remove the fuel valve from the fuel tank to clean or replace the tank filter screen mounted on the fuel control valve. The filter is most likely clogged with...
Question
Gas cap loose and check engine soon light comes on
Hi. In some cases I have seen that after market gas caps do fix the engine light for the gas cap. I suggest you try getting a gas cap from the Buick dealership and have the engine light reset properly....
Question
My check fuel fill inlet keeps popping up and I don't have a gas cap
Hi there. The fact you're missing the gas cap is most likely what's causing the check fuel fill inlet to keep popping up. Believe it or not, the fuel cell is a highly balanced containment system that requires to maintain...
Question
Emissions test failed with a new gas cap
Hey there. This may be related to other possible malfunctions in your EVAP system, such as a faulty vent valve solenoid. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects...
Question
How do I fix the issues related to code P0445 (Failed Emissions Test)?
Diagnostic Trouble Code P0455 has causes in addition to a faulty or loose gas cap. In your circumstance, the first thing you should do is reset the Check Engine Light which will erase the existing codes. Then see if the...
Question
Gas tank implodes/ won't fill.
Your fuel tank is going into a vacuum when the engine is running. The vacuum condition is causing the fuel tank to collapse and the gas cap is supposed to let in fresh air from the outside to keep the...
Question
Gas cap notification and check engine light came on after getting gas. Car started to sputter and stall out.
Hi there. When the fuel cap is not securely fastened to the tank, it can create vacuum issues inside the tank; which triggers the error code to be stored in the ECU. The error will then trigger the check engine...
Question
Will the Check Engine Light turn off by itself or do I need to manually turn it off after I fix the problem?
Hey there, thanks for writing in. The computer for this year will not turn off the light on its own until the Check Engine Light is turned off using a scanner. The Check Engine Light should be scanned to document...
Question
Gas Cap
The first to do is to look at the gas refueling location to see if you have the no cap design or the cap is just missing. If you have the no cap design then you do not have to...
Question
I just had the fuel fill inlet replace and the gas door light came on again. Seems like the light comes on from driving in rain or going through a car wash. What is happening?
Hi there. If water is getting into the fuel door and flooding the gas cap area, first check the gas cap for a good seal. The cap should seal the fuel and vapors in and not leak out. If the...
Question
The gas cap on my car broke off. (The black knob you use to screw in the gas cap.) The gas cap is stuck securely in the fuel neck. How can I remove it?
Hi there. To remove the gas cap that broke off, get a pair of needle nose pliers and use it to remove the gas cap. Try to locate a part of the gas cap that you can grab with the...

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