Capture fuel-tank vapors and route them back into the engine to be burned with the Standard Ignition Vapor Canister CP3784. This charcoal EVAP canister drops in as a direct-fit OE replacement for the 2020-2024 Chevrolet Silverado 2500 HD, 2020-2023 Chevrolet Silverado 3500 HD, 2020-2024 GMC Sierra 2500 HD, and 2020-2023 GMC Sierra 3500 HD, all with the V8-6.6L engine.
As part of the evaporative emission system, the canister adsorbs fuel vapor from the fuel tank into its activated charcoal and holds it until the engine draws it through the intake, rather than letting it vent to the atmosphere.
- Charcoal filter media: filter element included for vapor adsorption.
- Three ports: Port Quantity 3; ships as a canister without a gauge.
- Durable black housing: built to withstand temperature swings and exposure to chemicals and debris.
- Engineered for GM applications: lab- and vehicle-tested so the complex EVAP system operates as the OE intended.
Country of origin: United States.
Interchange: CP1948 · FVCD30291 · 2-70645 · 270645 · 84325521. Manufacturer part number CP3784.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the CP3784 vapor canister do?
It stores fuel vapors from the fuel tank in activated charcoal, holding them until the engine's EVAP system purges them into the intake to be burned instead of venting to the atmosphere.
Which vehicles does it fit?
It's a direct-fit replacement for the V8-6.6L 2020-2024 Chevrolet Silverado 2500 HD, 2020-2023 Chevrolet Silverado 3500 HD, 2020-2024 GMC Sierra 2500 HD, and 2020-2023 GMC Sierra 3500 HD. See the Buyer's Guide tab.
Does it include a filter or a gauge?
The canister has charcoal filter media with the filter element included and three ports, but it ships as a canister without a gauge.
What are signs the canister may need replacing?
A persistent fuel odor, an EVAP-related check engine code, or a fuel-vapor leak may point to a failed canister. Diagnose the cause before replacing, since these symptoms can have other causes.
What numbers does CP3784 interchange with?
It replaces CP1948, FVCD30291, 2-70645 (270645), and 84325521.
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