Vehicle Questions and Answers
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The main reason you might notice a loud clanking noise coming from your gas tank is likely because the purge valve is faulty. This happens when the purge valve fails and dislodges from its position, causing it to move around near the gas tank. Replacing the valve will set you back around $30 to $80, depending on whether you opt for an aftermarket or OEM part. If you decide to have a professional fix it for you, the total cost, including parts and labor, will be in the range of $300 to $550.
If you notice any unusual sounds coming from your fuel tank, it may be necessary to replace the purge valve.