This procedure addresses a common misunderstanding: the 1966 Chevrolet Corvette with 327ci V8 was not equipped with an EVAP (Evaporative Emission Control) system or EVAP vent valve, as these components were not mandated until the 1970s.

Warnings

Preparation

1. Verify the vehicle identification number and engine code to confirm this is an original 1966 Corvette with 327ci V8
2. Inspect the fuel system components visually to determine if any aftermarket EVAP equipment has been added during previous ownership

Procedure

1. 1

   Verify Vehicle Configuration
   Confirm the vehicle is a 1966 model year Corvette by checking the VIN plate on the driver side door pillar or dashboard. The 1966 Corvette uses a simple fuel tank venting system with an open vent line to atmosphere, not a closed EVAP system.
2. 2

   Inspect for Aftermarket EVAP Components
   Check the engine bay, near the fuel tank, and along the frame rails for any aftermarket charcoal canister or vent valve assemblies that may have been added to comply with state emissions regulations in later years. If aftermarket EVAP components are present, document their location and connections before proceeding with removal or service.
3. 3

   Understand Original Fuel System Venting
   The 1966 Corvette 327 V8 uses a vented fuel cap and a simple vent tube from the fuel tank that routes to atmosphere, typically exiting near the rear of the vehicle. This is the factory-correct configuration and requires no EVAP valve maintenance.

Reassembly

1. No reassembly required for this informational procedure

Verification

• If the original issue was fuel odor, verify the fuel cap gasket is intact and sealing properly
• Check that fuel tank vent lines are not kinked, blocked, or deteriorated
• Ensure carburetor bowl vents are properly routed and not causing fuel vapor escape into the engine bay

More procedures for this vehicle