Anyone else have fuel vapours coming.from filler neck ?

[72MARIO]

I completed my ls swap using a in tank fuel module from a 2003 truck. The system has a feed and return line. I am finding that there is now a excessive amount of fuel vapour coming from the vented gas gap. I have a 1/4" line from the intake thats capped down at the transmission and a 1/4" line from the fuel module. Has anyone run thoes lines into a charcoal can and used the factory valve in the intake to vent the system ?