fuel circuit leak

2007 CHEVROLET IMPALA
75,525 MILES • 6 CYL • FWD
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NJBOB
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chk eng lite on.after ******* up.trouble code saya leak in that system.how to check?
Mar 5, 2011 at 10:35 PM
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WRENCHTECH
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What was the exact code number?
Mar 5, 2011 at 10:46 PM
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NJBOB
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shows code po455 large leak evap system
Mar 5, 2011 at 10:48 PM
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WRENCHTECH
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  • ASE Certified Mechanic
The evap system is the inside of the fuel tank. The most common reason for that code is leaving the gas cap loose or off. I would check the cap and clear the code and see if it comes back. It doesn't effect engine performance at all.
Mar 5, 2011 at 10:55 PM
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MHPAUTOS
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Start with checking the fuel cap and the EVAP system for leaks look for a vacuum leak in the system, start here.

mark (mhpautos)
Mar 5, 2011 at 10:58 PM
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