Sorry I know this is one of my first posts, but I know that this forum is friendly and helpful, and im lookimg forward to being part of this community for long term ( I love my 8L S3) but I need some assistance and I feel someone else may have had this issue. I have a intermittant starting issue on my stage 2 8L S3 (BAM), seems fuel related, from cold start it will crank and crank and just hiccup, but not always start. No codes stored, all sensors are okay (have changed crank sensor, CTS, tried another good MAF), no air leaks, checked fuel pressure and on first prime only gets 1 bar to the rail, upon key off and reprime back up to 3 bar and starts fine. Once engine is off, pressure drops like a stone from the rail (inlet side, not return), checked FPR and all okay (tried a new 4 bar as well with same issue) What would you expect rail pressure wise on first prime? Car has a DW uprated pump, is there a check valve on the pump unit in the tank to maintain pressure in fuel line? Any help would be great as it's driving me crazy, thank you everyone.