![]() If this happens, simply loosen the gas cap until the light goes off. This can cause the pressure sensor to malfunction and give a false reading. Though this occurs rarely, the check fuel cap indicator may come on if the gas cap is over-tightened. ![]() Either way, if your gas cap light comes on, it’s important to have the issue diagnosed and repaired as soon as possible. This can happen if the vent line becomes clogged with debris or snow. Another possibility is that there is a blockage in the vent line from the gas tank. One reason could be a faulty pressure sensor. There are a few other reasons why your gas cap light may come on, even if the fuel cap is tightened correctly. What Are the Other Reasons for a Gas Cap Light Coming On? When the pressure sensor detects a loss of pressure, it will activate the gas cap light on the dash. This system uses a pressure sensor to detect when the fuel system is not sealed correctly. The gas cap light warning system is designed to alert the driver when the fuel cap is not tightened correctly. How Does the Gas Cap Light Warning System Work? There is also a very low, but real chance that the vapors can ignite, with the flame traveling down into the gas tank. When the gas cap doesn’t seal the fuel tank completely, the gasoline fumes can escape into the atmosphere, which poses a serious environmental issue. ![]() This is usually due to the fact that the O-ring on the gas cap is not seated correctly, or there is something preventing the gas cap from sealing properly. The gas cap light warning comes on in your Jeep when the fuel cap is not tightened correctly. This can be a bit confusing, especially if you’re not sure why it’s happening or what its significance is. If you’re an owner of a Jeep, then you may have noticed that the gas cap light warning comes on periodically. ![]()
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