[Stlhotrod]

I think they are the same in the Trailblazer as the SSR for the fuel tanks.

 

[Autoprof]

If it's leaking at the fuel filler neck, there is a repair kit available. There was a TSB or extended warranty to cover this on SSRs and Trailblazers as well.
see more information here

SSR Videos from RetroCarGuy530

2003-2004 Chevy SSR - Repair Leaking Fuel Tank Inlet Check Valve This video shows you how to use the Dorman Products Fuel Inlet Valve 577-106 to repair a leaking fuel tank inlet check valve for the 2003-2004 Chevy SSR / 2002-2004 Chevy Trailblazer Base / 2004 Chevy Trailblazer SS - Repair...

www.ssrfanatic.com

 

[Stlhotrod]

And the tanks are different between 03/04 and the 05/06 models