I have an 06 STi. Last fall I had a lot of upgrades done including a Walbro fuel pump. Ever since then I've noticed it takes fuel VERY slowly. It doesn't matter where or what pump, I have to barely crack the lever to keep it from cutting off. It's also noticeably worse the hotter the weather.
Could there be a pinched vent line ? Have any of you guys ever heard of such a problem ? Help me out if you can. Thanks, Okey