Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 119 (ENGINE CONTROL SYSTEM - SYSTEM & COMPONENT TESTING)EMISSION SYSTEMS & SUBSYSTEMSEVAPORATIVE EMISSION CONTROL SYSTEM DIAGNOSISEVAP CANISTER INSPECTION
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
EVAP Canister Inspection
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION EVAP Canister Inspection
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the EVAP canister.
- Visually inspect the EVAP canister, especially at the arrows, for any cracks or damage. See Fig 1 .
- Plug the vent port (4). The vent port will remain plugged for all tests. See Fig 2 .
- Block the purge port (3) closed. See Fig 2 .
- Blow air with a pressure of 0.25 psi (1.7 kPa) into the EVAP vapor port (2). See Fig 2 .
- Verify that air flows out of drain hose (1). See Fig 2 .
- Block the purge port (3) and the drain hose (1) closed. See Fig 3 .
- Blow air with a pressure of 0.25 psi (1.7 kPa) into the EVAP vapor port (4).
- Verify that air does not flow out of the air inlet port (2). See Fig 3 .
- Block the air inlet port (2) closed. See Fig 4 .
- Connect Hand Vacuum Pump (J 23738-A), or equivalent, to the purge port (1). See Fig 4 .
- Apply 1.0 in. Hg of vacuum to purge port (1) with the hand vacuum pump. See Fig 4 .
- Verify that the vacuum holds while the air inlet port (2) is closed. See Fig 4 .
- Open the air inlet port (2) and verify that the vacuum is released. See Fig 4 .
- Block the air inlet port (1) closed. See Fig 5 .
- Connect the hand vacuum pump to the EVAP vapor port (3). See Fig 5 .
- Apply 1.0 in. Hg of vacuum to the EVAP port (3) using the hand vacuum pump. See Fig 5 .
- Verify that there is vacuum pressure at the purge port (2). See Fig 5 .
- Replace the EVAP canister if the canister failed any of the inspections or tests.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.