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What is the vent valve on the EVAP system and where is it located.

Tiny
MSCHENKEL
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 49,900 MILES
I have a P-0440 engine code for the evap system. I have replaced the gas cap with a new locking one and in one of the answers on this site for the same problem you indicated that it could be a malfunctioning vent valve. What is this and where is it located so that I can replace and get this code out of the system.

thank you
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Tuesday, August 30th, 2011 AT 2:45 PM

1 Reply

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The vent valve is what the evap system uses to close off the evap system so the computer and check for leaks. Its right by the fuel filler neck.I would follow the trouble tree instead of just replacing parts. Some of those locking gas caps I have seen cause evap codes.
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Wednesday, August 31st, 2011 AT 1:04 AM

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