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General Discussion
Why does my Silverado keep fixing itself?
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<blockquote data-quote="d_daffron" data-source="post: 535784" data-attributes="member: 4983"><p>Gas cap codes are set by the EVAP emissions system. The tank on your truck is sealed and the ecm pulls a vacuum on it to check for leaks. As for why it does it, the ecm only runs the test when the tank is below a certain fuel level it used to be a that it would only check for leaks when fuel level was below 1/4 tank. </p><p></p><p> EVAP leaks are a pain to locate. Theres a test port underhood on the fuel tank vent line that leads to the intake manifold. The dealership has a smoke machine that connects to that test port and injects smoke to find the leak.</p><p></p><p> The problem could be anything from a leaking EVAP purge solenoid, a leaking EVAP vent solenoid, a small hole in one of the fuel tank vent lines, or even a bad gas cap.</p><p></p><p> EVAP codes will not affect how the truck runs or operates, its just annoying having the check engine light on. Do you usually fill the tank right before you drop the trailer and drive it for a week? That would explain why the light goes off and stays off for a while until the fuel level drops enough to allow the ECM to check for leaks.</p></blockquote><p></p>
[QUOTE="d_daffron, post: 535784, member: 4983"] Gas cap codes are set by the EVAP emissions system. The tank on your truck is sealed and the ecm pulls a vacuum on it to check for leaks. As for why it does it, the ecm only runs the test when the tank is below a certain fuel level it used to be a that it would only check for leaks when fuel level was below 1/4 tank. EVAP leaks are a pain to locate. Theres a test port underhood on the fuel tank vent line that leads to the intake manifold. The dealership has a smoke machine that connects to that test port and injects smoke to find the leak. The problem could be anything from a leaking EVAP purge solenoid, a leaking EVAP vent solenoid, a small hole in one of the fuel tank vent lines, or even a bad gas cap. EVAP codes will not affect how the truck runs or operates, its just annoying having the check engine light on. Do you usually fill the tank right before you drop the trailer and drive it for a week? That would explain why the light goes off and stays off for a while until the fuel level drops enough to allow the ECM to check for leaks. [/QUOTE]
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Why does my Silverado keep fixing itself?
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