How to remove evap vent valve

jigsaw71 · February 15, 2013

Hey guys,

I have done lots of checking in the back forums but could not find out the info I need. I have a 2000 Sierra with a 5.3 and I am getting a p0446 code and I finally found the vent valve but it is in between the cab and the bed of the truck. I can see it if I shine a light between the bed and cab, and I am stymied as to how I am going to get this stupid thing off. Does anyone have any tricks that I can use to get this thing off without removing the bed of my truck?

bossier62guy · February 15, 2013

Here's the service info....haven't done one myself so can't give you any first hand info.

EVAP.pdf

Lazlo · March 13, 2013

Just had this done on my 2009 5.3 Sierra after getting the same p0446 code. With 48,000 miles of light usage, this failure seems to me to be early in the vehicle life. Can anyone suggest to me what is the cause of this failure? The repair "professionals" were absolutely no help with this. Additives, gas type/octane or just a cheap/defective part, there must be some explanation.

What say you? Any help will be greatly appreciated.

Thanks,

bossier62guy · March 13, 2013

Are you in the habit of forcing more fuel into your truck after the pump shuts off? If so, get out of that mode.....If not you can probably attribute it to parts made in China.

txab · March 13, 2013

Are you in the habit of forcing more fuel into your truck after the pump shuts off? If so, get out of that mode.....If not you can probably attribute it to parts made in China.

+1

Pretty common reason for failure

Lazlo · March 13, 2013

Thanks guys for the 2 quick replies. So noted on the overfill. Certainly not a habit with me, but can't deny ever trying to squeek in a little more, on a rare occasion. Good to know that when the pump is done, so am I. Kind of a sad commentary that dealers either aren't aware of this reason for failure, or refuse to disclose it to owners.

Many thanks again, for the head's up.

GMCustomerService · March 13, 2013

Just had this done on my 2009 5.3 Sierra after getting the same p0446 code. With 48,000 miles of light usage, this failure seems to me to be early in the vehicle life. Can anyone suggest to me what is the cause of this failure? The repair "professionals" were absolutely no help with this. Additives, gas type/octane or just a cheap/defective part, there must be some explanation.

What say you? Any help will be greatly appreciated.

Thanks,

Has your concern been resolved? Are you working with your GM dealer? Keep me posted and feel free to reach out if you need additional assistance. Thank you.

Tricia, GM Customer Service.

Lazlo · March 14, 2013

Has your concern been resolved? Are you working with your GM dealer? Keep me posted and feel free to reach out if you need additional assistance. Thank you.

Tricia, GM Customer Service.

Tricia,

Thanks for your post and concern. I've read as many of the posts regarding the p0446 code on my vehicle. While others may have the time and temerity to attempt to fix this emission system failure, I, do not. 2 hours at the dealer, and $273.78 later, I am on my way, happy in the knowledge that my GMC will not be venting gasoline vapors into the environment. Oh happy day...

The dealer had no idea what caused it, except that it had failed. Other enthusiasts here on the site, provided me with more of an explanation and suggestion than the so called "experts" at the dealership.

It's knowledge that really helps a responsible owner take care of his investment.