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Need trouble shoot on EVAP system

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Old Jun 28, 2011 | 11:24 PM
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Default Need trouble shoot on EVAP system
I recieved code P0440 on my 2002 corvette it was reset after 2 weeks light came on again Same code reappeared...reset again and replaced gas cap...what is the next step to resolve this check engine lite. If so what part should I order.
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Old Jun 29, 2011 | 05:37 AM
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Haven't had this on the Vette, but have had it numerous times on my daughter's Jeep. Every time it turned out to be a cracked rubber hose. I would check the hoses for leaks (many are hard hoses on the Vette) and if there are any rubber hoses check them for cracks and leaks.
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Old Jun 29, 2011 | 07:05 AM
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As stated, got a hose cracked somewhere. Try to google the EVAP system diagram so you can check just the hoses that goes with it instead of chasing your tail with every vaccum hose on the car.
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Old Jun 29, 2011 | 09:54 AM
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*EDIT* Post removed... eventually I'll learn not to read so fast.
Last edited by cdkcorvette7; Jun 29, 2011 at 11:18 AM.
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Old Jun 29, 2011 | 10:11 AM
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Originally Posted by cdkcorvette7
Have you removed your intake manifold recently (or has a shop removed it)? The little vacuum supply line off the back of the manifold is easy to break. Another common evap vacuum problem is caused by battery acid dripping down onto the evap lines that run beneath the battery tray... Pull your battery and check for acid drip.
I think the EVAP line is on the drivers side of the engine if I remember correctly.
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Old Jun 29, 2011 | 10:32 AM
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...
Last edited by cdkcorvette7; Jun 29, 2011 at 11:18 AM.
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Old Jun 29, 2011 | 10:47 AM
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Originally Posted by cdkcorvette7
Pretty close to dead center off the back of the manifold very slightly to the passenger side underneath the MAP sensor (unless my memory is going... I did just turn 26 )
This is what I was referring to:


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Old Jun 29, 2011 | 11:17 AM
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That's what I get for reading a thread too fast. He said EVAP and I read HVAC... I'll edit my earlier posts as they will be of no help in fixing this issue.
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Old Jun 29, 2011 | 11:48 AM
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Thanks will work on this and get back to you...
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Old Jun 29, 2011 | 12:13 PM
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The cansiter is back by the passenger side fuel tank so you will need to trace lines for the whole system and not just under the hood. Check for leakage as well as cracks.
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