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Jeep CJ7 Gas Cap

Indications of a Jeep CJ7 Gas Cap Going Bad

The safety of the gas inside the gasoline tank relies on your gas cap or fuel cap. This lid seals gas fumes that tend to escape the tank. In addition, it protects the gas from contaminants that can cause combustion problems to your jeep. More importantly, it keeps the pressure in the tank at standard level in order to allow release of gas into the engine. Damage in your gas cap can cause different issues. Following are just some of them:

Gas odor

A common issue with your fuel cap is indicated by a strong smell of gasoline outside your automobile. This may be due to gas fumes escaping the tank. This means that your gas cap is not properly closed and sealed, allowing the fumes to escape. When you smell the gas odor, immediately check your fuel cap and adjust its position.

Poor fuel mileage

Gasoline is a highly volatile substance. This means that, not only is it flammable, it also evaporates quickly. That being said, you need to make sure your gas cap is properly sealed all the time. Gas fumes can escape from the tank and decrease your gas level if it continues to be unnoticed. If you experience poor fuel mileage, you may need to check your Jeep CJ7 gas cap for a broken or leaking gasket.

No start

Despite being located outside your automobile, your fuel cap is still connected to your engine. If your engine does not start, it may not be receiving enough gasoline to burn. This problem may be caused by a vacuum in your gas tank. More than being a lid, your gas cap is a valve that allows air to enter the gas tank to allow release of gasoline when needed. If your fuel cap does not vent air, a vacuum develops inside the tank, making it difficult to release gasoline into the engine.

Blown fuel filter

Another serious issue that may arise from the vacuum inside the gas tank is a blown fuel filter. The vacuum from the tank can travel through the fuel lines and into the fuel filter, causing stress to the fuel filter. As a result, the part blows and becomes damaged. When this happens, check your Jeep CJ7 gas cap immediately.

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  • Taking Good Care of Your Jeep CJ7 Gas Cap 27 February 2013

    The reliability of your gasoline tank relies on the Jeep CJ7 gas cap which plays several important roles for the gasoline and the tank. It seals the gas fumes that may escape from the tank. Also, it keeps external elements from contaminating the gasoline and the container. More importantly, it keeps pressure inside the gasoline tank in order to efficiently release the right amount of gas whenever the engine needs it. With this, you need to make sure the gas cap is serving you well all the time. Following are some tips on how you can do so:


    Regularly clean the Jeep CJ7 gas cap.


    Your gas cap is exposed to a lot of gasoline especially whenever you have your tank full. Because of this, gasoline deposits can build up on the underside of the gas cap. These deposits can clog the air vent of the cap. When this happens, a vacuum develops inside the tank, making the release of gas difficult. To avoid such issue, make it a habit to clean the gas cap from time to time. Carburetor cleaner and a clean rag are enough for the task.


    Occasionally check for the gas cap pressure.


    More than a lid that secures the gas inside the tank, the gas cap is a valve that provides the ideal pressure inside the gas tank. Once it does not provide the correct pressure, there would be problems with the release of the gas into the engine. With this, you need to constantly check if the gas cap provides the correct pressure for the tank. The pressure test can be done by connecting a small pump to the evaporating system of the engine.


    Mind the Jeep CJ7 gas cap gasket.


    To help seal the gas vapor in the tank, the gas cap has a gasket on its underside. Like most washers and seals, this gasket deteriorates over time. With this, you need to check this as well every time you check the gas cap. You also have to lubricate it to extend its service life and avoid dry rotting. If you notice that the gasket is already in a poor state, you may opt to replace it with the same one.