Forum | Marketplace | Knowledge Base | | H1 site | H2 site | H3 site
Click Here To Visit Plan B Supply
Click Here To Visit Plan B Supply
Click Here To Visit BlueHummer Outfitters
Click Here To Visit BlueHummer Outfitters
Click here for a listing of all HUMMER Network sponsors

Hummer Knowledge Base

The Hummer Knowledge Base

Plugged H2 Evap Cannister:

Plugged Evap Canister....check engine light, DIAG Code P0446:

The charcoal evap canister (located on the passenger side frame rail) can get full of muck because the evap valve sucks it in. The evap system runs a vacuum test on the fuel tank integrity at random by putting a vacuum on it, never above a 3/4 tank of fuel, and never below a 1/4 tank of fuel. If you keep the tank full when wheeling, it wont be a problem. It was just bad luck that mine filled with muck......the system ran the test just at the time I was going thru muddy water. If you drive in dusty conditions, it will also eventually fill the canister with dust. Street queens will probably not have a problem with the evap system, ever. The only thing you can do about it is to keep the fuel tank full when wheeling.


Back to main page

The Hummer Knowledge Base is a collection of informative posts from the Hummer Network forums and mailing lists, contributed material and links to outside web sites.
The Hummer Network is not responsible for the accuracy of the information contained herein or on outside web sites, nor for any situation arising from the use thereof.
2006-2011 by The Hummer Network. No material from the Hummer Knowledge Base may be reprinted or republished in any form without permission.