One further point as I note you say the lift pump is new?
The only other way fuel can get into the sump in any quantity is the Injector pumps
seals (Did they specifically get changed or the pump just pressure checked/timed) worth asking the re-builder!(Most Likely after lift pump issue)
Last item would be one or more of your injectors badly leaking (no likely)you should notice the running condition/smoking of
engine
Cheers Steve