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fuel tank problem

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Old Aug 11, 2014 | 05:53 PM
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rfbristow
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Smile fuel tank problem

when i remove the gas cap,the fuel tank on my 1979 f100 is blowing out fumes. what can i do the solve this problem?
 
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Old Aug 11, 2014 | 06:17 PM
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Blue and White
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The cap is holding pressure. Unless it has an evaporative emissions setup, the cap needs vented. Either buy a vented cap or drill a very small hole in the cap you have.

Even the vented cap will hold some pressure (or vacuum) before it releases so you might wind up doing both like I did. A new vented cap with a small hole added.
 
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