100% Free

No Scanner Needed

Carly logo
Prices

lindaschulze8

VW Lupo Fuel Tank Vent System Causes Engine Stalls

My Lupo keeps stalling at idle and the check engine light is on. The last mechanic mentioned an issue with the fuel tank ventilation but never fixed it properly. Now I suspect a leak in that system. Anyone dealt with similar symptoms in their Lupo? Car specs: 2003 VW Lupo 1.4 gasoline, 26833km. Looking for tips before visiting another mechanic to avoid getting ripped off again.

Summary of the thread

The VW Lupo is experiencing engine stalling at idle, with the check engine light on, likely due to issues in the fuel tank ventilation system. Possible causes include a faulty purge valve, a clogged activated charcoal filter, or a leak in the EVAP system. Suggested solutions involve a thorough inspection of the EVAP system, replacing the purge valve and charcoal filter, and conducting a system pressure test to ensure proper sealing and function. Proper diagnosis and repair can restore engine performance and fuel efficiency, preventing further damage and emissions issues.

Did this summary help you solve your problem?

4 comment(s)

TommySchroeder

Had similar symptoms with a 2006 VW Polo 1.4 FSI. The fuel efficiency dropped significantly and the engine would stall at idle. Diagnostic tests revealed a faulty purge valve and a clogged activated charcoal filter in the EVAP system. The leak detection pump showed system failure, confirming issues with the fuel tank ventilation. The charcoal filter was completely saturated, preventing proper vapor recirculation. This caused irregular fuel mixture and idle problems. The fix required: Complete EVAP system inspection, Replacement of activated charcoal filter, Purge valve replacement, System pressure test This was a serious issue that needed immediate attention, as it affected both emissions and engine performance. Leaving it unfixed risks damaging other components and further reduces fuel efficiency. Common signs pointing to this problem: Stalling at idle, Check engine light, Strong fuel smell, Failed emissions test, Rough idle after refueling Recommend getting the EVAP system thoroughly checked, particularly the charcoal filter and purge valve components.

lindaschulze8 (community.author)

Thanks for sharing your experience. I had exactly the same symptoms with my Lupo last year. The emission control system inspection revealed similar issues, and replacing both the purge valve and charcoal filter solved the problem completely. Do you remember roughly how much the repair cost in total? Also curious if everything has been running smoothly since the fix or if you noticed any related issues popping up later? My car has been fine so far, but I like to know what to watch out for.

TommySchroeder

Great to hear your Lupo got the same fix that worked on my Polo. The fuel tank ventilation system leak was completely resolved after replacing the defective activated charcoal filter, which cost 275€ including labor. The EVAP system has been working flawlessly since the repair, no check engine lights, stalling, or emission control issues for over a year now. The pressure sensor readings have remained stable, showing no signs of new leaks. Regular maintenance checks show the new components are holding up well. Fuel efficiency returned to normal and the engine runs smoothly at idle. Just keep an eye on your fuel consumption, any sudden increase could indicate the EVAP system needs attention again. But these parts typically last several years when properly installed.

lindaschulze8 (community.author)

Since the repair three months ago, my Lupo has been running perfectly. The total repair came to 320€, which included the new purge valve, charcoal filter, and labor costs. The mechanic I found did a thorough job with leak detection and air flow testing to make sure everything was sealed properly. The difference in performance is remarkable. No more stalling at idle, the check engine light stays off, and the fuel efficiency is back to normal. The pressure sensor readings are steady now, showing the system is working as intended. For anyone dealing with similar issues, I suggest finding a shop that specializes in VW fuel systems. The previous mechanic missed these problems entirely, but the new one diagnosed it right away with proper diagnostic equipment. Worth every cent to have it done correctly the first time.

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

VW

community_crosslink_rmh_model

LUPO