2003 Gmc Envoy There Canister On Passengers Side Behind That Continues Thump S

2003 GMC ENVOY
70,000 MILES
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There is a canister on the passengers side behind that continues to thump, like it's trying to work. I pulled the vacuum (about 3/4" dia) and very little vacuum was coming from the canister. Is that a holding tank for a intake manifold vacuum or is there an electric pump feeding it..

Terry
Feb 21, 2013 at 5:09 PM
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HMAC300
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i think you are talking about the evap canister if it's by the fuel tank. reconnect the vacuum line.
Apr 22, 2013 at 11:24 PM
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