Trouble starting when full of fuel

William Melvin

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May 22, 2021
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2011 GMC SIERRA 5.7 350 6 SPEED AUTO
When I get a full load of gas the rig doesn't want to start for some reason. The starter engages but doesn't seem to get a bite on the flywheel. 2 or 3 attempts and it catches. The ONLY time it ever does this is at the gas pump after I fill up. Crazy, but I would like to get to solving this mystery.
 


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