Problem trying to fill gas tank HELP ! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-16-2010, 09:31 PM   #11
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this doesn't figure why if I shut it off it fills fine, but when running it doesnt ???

Its gotta be something with the venting I would think
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Old 03-16-2010, 09:33 PM   #12
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The EVAP system is the vent
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Old 03-16-2010, 09:51 PM   #13
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With what sounds like a common practice for you, running the car while filling the tank; I would recommend replacing the canister at a minimum. Also, I would pull the evap line from the fill to the canister and check it for a blockage. If there is no blockage and you've replaced the canister, then the purge valve should be okay.
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Old 03-16-2010, 10:02 PM   #14
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again, why the problem when its running and not when its not running ??

Can I drill a hole in the canister and drain it then put a screw in the hole ??

It just doesnt make sense that when its not running it fills fine, does it ?
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Old 03-16-2010, 10:08 PM   #15
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The canister will clear it'* self, but will take time. Because the vent is plugged with raw gas the air that is being displaced by the fuel can not get out, so it'* only way out is threw the fill tube.
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Old 03-16-2010, 10:18 PM   #16
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But AGAIN why does it fill fine when not running ???? This is the question I dont understand, if this is the case wouldn't it have a problem running or not ??

Today it wouldnt fill, I shut it off it filled fine, started it back up would fill ???
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Old 03-16-2010, 10:21 PM   #17
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The vent is plugging because there is a vacuum there. Shut off the vacuum and the fuel is not sucked in to the vent, the vent can then vent.
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Old 03-16-2010, 10:34 PM   #18
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humm not sure if I grasp that 100% but ok, so... should I just clear the code, run it and keep shutting it off when filling ?

Or should I try to do something else ?

Thank you
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Old 03-16-2010, 10:36 PM   #19
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Do not run the engine when filling, the vacuum will suck up gas, and you risk blowing up.

Reset the code and drive. It may take a while for the system to clear out.
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Old 03-16-2010, 10:44 PM   #20
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10-4 I will give it a try...

Should I drill a hole in the canister to drain ???
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