Nasatter

I've had the car scanned and no fault codes are coming up.

Could a faulty HPFP cause the car not to fire up? When it did fire up it was idiling very lumpy, could this be the cause.

My audi a3 diesel isn't starting. I've changed the fuel, filter and ancillary pump and injectors. It started but was rough idling and after driving around the block it cut off and hasn't started again. I've tried getting any air lock out and unsure what to try next. Any idea's what it could be?