M3 E36 4door fuel smell when interior fan/aircon is on

Hi guys,

I have read about other related topics on the infamous fuel smell issue on the e36's.

Mine seems different though. I only experience this problem when the interior fan/aircon is on while driving slowly in traffic or at a red light. If i'm on the highway and the aircon/fan is on there's no fumes. When driving with the aircon/fan off in all conditions there's no fumes.

Any help will be highly appreciated.