Crankcase fumes

[5022]

My isx on startup when the actuator moved for quick heat up I would get a raw fuel smell that would about run you out of the truck when the actuator moved it was gone. the doser wasn't leaking the turbo passed all tests but for some reason the woven stainless downpipe would be smoking like a toker. Put three down pipes on it to no resolve. Finally put cheaper flex one on still did it drove me insane if I remember right it would do it on a parked regen which my truck didn't do very often. Just a thought , I was never smart enough to get a handle on it. I just stretching my imagination but if you have an actuator it is moving to about the same position with the jake on mine was on a preheat. just thinkin