Stalling Wagoneer: Bad EVAP Purge Valve Symptoms

Had similar issues with a 2020 Grand Cherokee. The symptoms matched exactly, check engine light and stalling after refueling. The automotive repair revealed a clogged EVAP system with multiple failure points. The purge valve was stuck open, allowing excess fuel vapor into the engine. This created an overly rich mixture, causing the stalling. The main issue was actually debris buildup in the EVAP lines connecting to the fuel tank. The clogged hoses prevented proper vapor flow through the emission system. The fix required cleaning the entire EVAP system pathway and replacing the purge valve. While not a critical safety issue, leaving it unfixed can damage other components and affect fuel efficiency. The symptoms worsened over time until the engine would barely stay running at idle. Key diagnostic signs were: Stalling specifically after refueling, Rough idle, Check engine light cycling on and off, Gas cap clicking sound when removing Recommend having a complete EVAP system diagnostic done, including pressure testing the fuel tank and vapor lines. The purge valve is a common failure point but may not be the only issue.

Thanks for sharing your experience. The symptoms on my Wagoneer match perfectly, especially the stalling after filling the fuel tank and that annoying clicking from the gas cap. The pressure sensor testing and EVAP system cleaning you mentioned makes a lot of sense. Since you dealt with this already, do you remember roughly what the repair cost? Also curious if you had any related issues pop up since getting it fixed? My engine light just started flickering again yesterday, so I want to get an idea of what to expect at the shop. Really trying to avoid another frustrating repair experience.

Just wanted to follow up on the repair costs question. When I brought my Grand Cherokee in, the total came to 175 Euro for fixing the clogged hoses and cleaning the EVAP system. The tank ventilation valve malfunction was causing the gas cap clicking and pressure sensor issues, but once they cleared the debris and fixed the connections, everything worked perfectly. The emission system has been running smoothly since the repair, no more check engine light, stalling, or that annoying clicking noise from the gas cap. Its been about 18 months now without any related problems. The key was getting a thorough diagnostic of the entire vapor recovery system rather than just replacing parts. Getting the full EVAP system inspection might seem like overkill, but it saved me from repeated mechanic visits and prevented damage to other components. Just make sure they pressure test all the connections to catch any additional leaks while theyre in there.

I took your advice and finally got my Wagoneer fixed properly. Found a shop that actually took the time to test the entire EVAP system like you suggested. Turns out the clicking gas cap was definitely linked to a tank ventilation problem. The full diagnosis showed multiple issues in the emission system, clogged vapor lines and a faulty pressure sensor on top of the bad purge valve. Total repair came to 320 Euro, but they did a complete system cleaning and replaced all the worn parts. Been two weeks now and the check engine light has stayed off. No more stalling after fill-ups, and that annoying gas cap click is gone. Really glad I pushed for the full system check instead of just replacing the purge valve. The thorough approach definitely saved me from future headaches and repeat visits. Thanks again for pointing me in the right direction. The investment in proper diagnostics was worth every cent.