Where is the fuel canister purge valve located on a 2003 Chevy Blazer 4.3 vortex?

There isn't a single, readily identifiable "fuel canister purge valve" in the traditional sense on a 2003 Chevy Blazer 4.3L with the Vortex engine. The evaporative emission (EVAP) system on these vehicles uses a more integrated approach. The functions of a traditional purge valve are handled by components within the EVAP system itself, often controlled by the PCM (Powertrain Control Module).

Instead of looking for a specific valve, you'll likely find the components related to the purge function integrated into:

* The EVAP canister: The canister itself might have a solenoid or valve integrated into it.

* The fuel tank: Some components of the EVAP system are located near or on the fuel tank.

* The intake manifold: The vapor from the canister might be purged into the intake manifold via a line connected to a port on the manifold, with the flow controlled electronically.

To find the relevant parts, you'll need a repair manual specific to your 2003 Chevy Blazer 4.3L Vortex engine. A Haynes or Chilton manual, or a digital version from a subscription service like AllDataDIY, will show you diagrams and locations of the various EVAP system components. You can then visually inspect the hoses and components to check for leaks or malfunctions, though troubleshooting EVAP problems can be complex.