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The Hummer Knowledge Base
H2 Fueling Issues:
f you get a Diagnostic code for the EVAP system, P0446 in particular, or if you start to have filling issues, where you can't seem to fill your truck up with fuel do the following:
Relocation of this filter assembly is possible but may cause issues with filling your fuel tank.
- Crawl under the drivers side rocker panel
- Locate the round container near the EVAP canister
- Remove that round device (filter)
- Clean it up, as it is likely covered in mud and debris
- Re-install and clear code
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