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Old Sep 8, 2019 | 06:28 AM
  #1  
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Bourasma
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Engine light

I was fuelling up my 2012 f350 6.7 without shutting off the engine and when I removed the fuel cap the tank was on a huge vacuum and after 2 or 3 times I have a service engine light on. First of all I don’t believe the fuel tank should be on a vacuum if the fuel cap were vented properly. Any thoughts?
thanks
 
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Old Sep 8, 2019 | 06:52 AM
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I think you're right about the pressure in the tank. I rarely shut down when I'm fueling up and never noticed anything when taking the cap off.
 
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Old Sep 8, 2019 | 07:03 AM
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Thanks for the reply

Thanks, I’ll try a new fuel cap
 
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Old Sep 8, 2019 | 07:04 AM
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I don't know if it's the cap. There might be other ways these tanks vent. Somebody else will chime in.
 
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