Standard Ignition CP991 Vapor Canister Vent Valve

Vapor Canister Vent Valve for EVAP Service

Standard Ignition CP991 is a vapor canister vent valve for the evaporative emission control system. It uses a female rectangular connector, a solenoid-style internal design, and blade terminals to support a direct electrical connection at the vapor canister area.

Compatible With 2019-2024 Chevrolet Silverado 1500 and 2019-2024 GMC Sierra 1500 applications by the vapor canister, this Standard Ignition CP991 replacement is built for EVAP system service where vent control and sealed-system operation matter.

Key Features

• Vapor canister vent valve for evaporative emission control service
• Female rectangular connector for the vehicle harness connection
• Solenoid contents for vent-valve operation
• 2-port design for EVAP routing at the canister area
• Male blade terminals with 2-terminal electrical interface
• Standard Ignition CP991 replacement part number for catalog matching

Detailed Description

This vapor canister vent valve is used in the EVAP system to manage airflow at the vapor canister and help maintain proper sealed-system function. Standard Ignition CP991 is specified with one female connector, a rectangular connector shape, two ports, and male blade terminals, making it a practical replacement for service work on the evaporative system. It is listed for 2019-2024 Chevrolet Silverado 1500 and 2019-2024 GMC Sierra 1500 models by the vapor canister, and the CP991 part number can be used when matching the correct vent valve for those applications.

This part cross-references 2-33018 and 23357382 for the same application.

What It Helps Address

• EVAP vent valve faults related to vapor canister airflow control
• Check engine light concerns tied to evaporative emission system codes
• Fuel vapor sealing issues at the canister vent circuit
• Driveability complaints caused by vent valve electrical or solenoid failure
• Service replacement needs for Silverado 1500 and Sierra 1500 EVAP repairs

Installation Notes and Tips

Install at the vapor canister location and verify the connector style, terminal type, and port layout before replacement. Inspect the EVAP hose routing, electrical connector condition, and surrounding mounting points during service. Confirm the vehicle application against the part number CP991 before installation on 2019-2024 Chevrolet Silverado 1500 or 2019-2024 GMC Sierra 1500 models.

Quality Assurance

Standard Ignition is a recognized aftermarket brand for electrical and emission-control service parts. CP991 is cataloged for specific Silverado 1500 and Sierra 1500 EVAP applications to support accurate parts matching.