Charcoal Canister Notes: 1955-1972 Chevy/GMC Pickup

1955-1972 Chevrolet and GMC pickups — the Task Force (1955-1959), C/K "Action Line" (1960-1966), and Glamour-era trucks (1967-1972) — place the gasoline tank behind the seat, inside the cab. This is the defining design feature of these trucks, and the biggest source of fuel-vapor intrusion into the driver's space. A charcoal canister is the simplest, most reversible way to address it without relocating the tank.

What your vehicle came with from the factory

These trucks predate federal evaporative-emissions requirements (which began with the 1971 model year for passenger cars and shortly after for light trucks). None left the factory with a charcoal canister. The fuel tank vents through the filler neck and a vented gas cap.

What's vehicle-specific to watch for

• Because the tank lives in the cab, vapor mitigation makes a noticeable difference in daily-driver comfort.
• Many builders switch to a non-vented gas cap and add a tank-top vent fitting if the tank doesn't already have one from a prior modification.
• Consider routing the vent line through the firewall and forward to a canister mounted in the engine bay. Sealing the firewall pass-through is worth getting right — an unsealed grommet is a common source of residual cabin odor.
• Inner-fender mounting works well; the brake booster and master cylinder shouldn't conflict on small-block-equipped trucks.
• Tank-relocation builds (under-bed tank, frame-mounted cell) change the routing — the universal install guide covers the general approach.

Notable years & fun facts

• The 1955 Task Force introduced the wraparound windshield to American trucks — a feature borrowed straight from contemporary Chevrolet passenger cars.
• The 1967-1972 generation is widely considered one of the most stylistically influential American pickups ever made; Chevy reproduced the front clip almost verbatim for the 2019 "Cheyenne" concept.
• The 1969 Blazer K5, built on this platform, was Chevrolet's answer to the Bronco and Scout — and the ancestor of every modern Tahoe and Suburban SWB.

For the actual installation steps, see the universal Vapor Trapper installation guide — the procedure is the same across vehicles, only the routing and mounting changes.

Building something specific or unsure about routing on your application? Contact us with a few photos of your engine bay and tank area and we'll help you spec the right setup.

VaporCanister.com is an authorized retailer of the Vapor Trapper™ by Shop48.