1994 Chevy Suburban V8 Two Wheel Drive Automatic 209250 miles
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My truck failed the fuel evaporative controls functional portion of the functional check smog test. What could it be? And how much am I looking at in repairs? Thanks.

Without more information it will be difficult to be accurate. The evaporative failure might be something as simple as a cracked vacuum hose or a faulty gas cap. Were you at a test only station? Do you know a good, trustworthy mechanic?