When I open the gas cap, I hear a lot of air and the truck will shut off. Then it is extremely hard to start back. What could be causing this?
Aug 19, 2022 at 4:29 AM
Engine shuts off when opening gas cap, what causes this?
2016 CHEVROLET COLORADO
NOOPIES
- MEMBER
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AL514
- ✓ASE Certified Mechanic
- 5,587 POSTS
Hello, you're opening the gas cap with the vehicle running? Turn off the engine before you get gas, when you open the gas cap with the engine running, the Purge valve is most likely open at that point and you're causing a huge vacuum leak into the intake manifold. Shutting down the engine will close the Purge valve, open the vent valve and allow for refueling. Thats what the air sound is, its manifold vacuum being drawn into the gas filler pipe. Vehicles are not designed to be refueled when running. You're causing a huge Evap leak.
https://www.2carpros.com/articles/evap-system-code-repair
https://www.2carpros.com/articles/evap-system-code-repair
Aug 19, 2022 at 9:42 AM
STRAILER
- ✓ASE Certified Mechanic
- 54,832 POSTS
The purge solenoid could be stuck open remove the valve and try to blow through it to confirm, here is the location in the images below. Let me know what you find.
Image (Click to enlarge)
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Aug 19, 2022 at 9:47 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.