Gas Tank overflows on fill up - Chevy Colorado & GMC Canyon

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Old 04-04-2011, 05:52 PM   #1 (permalink)
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Default Gas Tank overflows on fill up

Help!

Does anybody know about this?

It happens at any gas station, any pump, any time of day or weather.


Thanks
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Old 04-07-2011, 03:32 PM   #2 (permalink)
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Default Re: Gas Tank overflows on fill up

Try filling your truck when it has !/2 of a tank,not when it's empty.
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Old 04-07-2011, 05:35 PM   #3 (permalink)
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Default Re: Gas Tank overflows on fill up

I think I get it, if it's on bone dry, the expansion tank is empty, or the shut off float is stuck way down?
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Old 04-07-2011, 11:48 PM   #4 (permalink)
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Default Re: Gas Tank overflows on fill up

Remove and clean (or replace) the evap vent valve. It is located underneath the bed right in front of the spare tire. It is mounted to the charcoal canister. One bolt holds it in place. You also need to disconnect one line and one electrical plug. The valve is stuck closed right now.
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Old 04-08-2011, 06:05 PM   #5 (permalink)
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Default Re: Gas Tank overflows on fill up

Thank you! Someone in work mentioned a valve, but this makes sense.
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Old 04-15-2011, 05:08 AM   #6 (permalink)
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Default Re: Gas Tank overflows on fill up

I'm sorry for the late response but I have been on the road for several weeks.

The evap vent valve is on the output of the charcoal canister. Normally air flows through the canister and the valve on fill up. The purpose of the valve is to alllow checking of the integrity of the entire fuel tank and feed system. The valve is closed on command and a pressure (or vacuum) check is performed by the engine computer. If the valve then sticks closed you will have problems when filling up the tank. Take it out and clean it.
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Old 05-25-2011, 12:23 PM   #7 (permalink)
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Default Re: Gas Tank overflows on fill up

i have the same problem on my o4 colly and i have a check engine light for evap leak in the back and my dash blinks gas cap, any suggestions?
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Old 05-26-2011, 04:33 PM   #8 (permalink)
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Default Re: Gas Tank overflows on fill up

:D The problem has been corrected, I crawled under the truck and did a rapa tap tap on the unit for a minute, because I didn't feel like getting into a teardown of the valve. I used a wooden handle from a hammer.

It's been 2 ? months now and no problem.. Thanks for the response everybody.
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Old 07-16-2011, 12:34 AM   #9 (permalink)
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my spits out almost everytime I fill up at an exxon, I think their hoses may push a little harder than most and yea as soon as it clicks off their is 1/10 of a gallon all over the ground
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