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Where is the Vapor Canister Vent Solenoid located on a 2003 Chevy Silverado 1500, 4.3L engine? And do you ave to remove the pick-up bed to access it, if it is on top of the tank?

I am trying to replace the Vapor Canister Vent Solenoid and the Vent/Filter thingy. I had the error code P0449 come up and it said it was a circuit malfuction. So I want to replace the Vapor Canister Vent Solenoid, if someone could tell me where to locate it on my truck and which piece it is that you are suppose to relocate?

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  • Cars & Trucks Master
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No you don't have to remove the pick up bed to get at it. It's on the left frame rail along side of fuel tank !
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle . Disconnect the evaporative emission (EVAP) canister vent electrical connector, if equipped. Disengage the 2 vent valve pipe clips securing the pipe to the underbody.
Remove the clips from the underbody and discard.
Disconnect the vent valve pipe at the EVAP canister. Remove and retain the EVAP canister vent valve bracket mounting bolt. Remove the complete EVAP canister vent valve assembly with bracket attached and discard.
Notice: Refer to Fastener Notice in the Preface section.
Video on youtube !

Posted on Dec 31, 2015

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HOW DO I CHANGE VAPOR CANISTER AND SOLONOID VENT VALVE ON 2003 CHEVROLET 1500 SILVERADO 4.8 ENGINE


Your best bet would be to obtain a small service manual ...Chiltons still prints them. They are available at just about every major autoparts store and run about $25 - $30 or so. You'd probably have to order it for your '03. Or look on Amazon. Another source for step by step "how to" is AutoZone's website. The beauty of the manuals are the pictures. They will show you where the vent valve is ...because there's a good chance it isn't on the canister. And the canister itself can be hidden away under some other piece of gear in the engine bay. A manual will also give you heads-up to any special considerations or procedures when doing the work. A picture's worth a thousand words but you could print a thousand words and still not paint the right picture. Get the book.

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The vehicle control module (VCM) monitors the performance of the evaporative emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system and monitors the vacuum decay rate. The VCM sets this diagnostic trouble code (DTC) if the vacuum decay rate is more than a predetermined value. The VCM monitors the amount of vacuum and the amount of pressure in the EVAP system by monitoring the fuel tank pressure sensor. For this DTC, the VCM turns ON both the EVAP purge valve and the EVAP vent valve when the Conditions for Running the DTC are met. This applies an engine vacuum to a closed EVAP system. The VCM turns OFF both the EVAP purge valve and the EVAP vent valve when the system reaches a correct amount of vacuum. The EVAP system should quickly RELEASE the vacuum in the EVAP system with the EVAP purge valve OFF and the EVAP vent valve OFF (open). This test indicates a blocked or restricted EVAP vent path if the EVAP system fails to release the vacuum quickly enough.

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1 Answer

My taurus failed due to code p0442 ecap emiss ctl sys leak detected (small leak)


    Continuous Memory Diagnostic Trouble Code (DTC) P0442 indicates that a fuel vapor leak has been detected [as small as 0.10 cm (0.04 inch)] in the Evaporative Emission (EVAP) system.
    Note: Prior to performing the following diagnosis inspect the Canister Vent Solenoid (CV) for contamination. A situation may exist where contamination holds open the Canister Vent (CV) solenoid enough to set DTC P0442 and also plugs the port to atmosphere enough to keep system from being vented quickly.
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    • Damaged, cross threaded or loosely installed fuel filler cap.
    • Small holes or cuts in fuel vapor hoses/tubes (EVAP canister tube, EVAP canister outlet tube or EVAP return tube) in the EVAP system.
    • Loose fuel vapor hose/tube connections to EVAP system components.
    • EVAP system component [EVAP canister purge valve, fuel tank pressure (FTP) sensor, canister vent (CV) solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly] seals leaking.
    • CV solenoid partially open when commanded closed.
    • EVAP canister leaking.
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  • Verify that the CV solenoid is properly seated on the EVAP canister (if possible).
  • Visually inspect for cut or loose connections to fuel vapor hoses/tubes in following locations:
    • EVAP canister to EVAP canister purge valve.
    • EVAP canister to fuel vapor vent valve assembly.
    • fuel vapor control valve tube assembly to fuel tank (if applicable).

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