I'd replace it again
Roger that.

With the bucking stopping when your tank is full, I have to defer to the more experienced gang here.
Yes, thats the part I can't quite figure out, thinking that maybe filling up is breaking a vacuum on the tank. What sorts of emissions hardware is there on the VX? Perhaps something is plugged?

Hope it works out for you, I know this takes away from that new car giddy feeling...but it should be resolved pretty soon I'd think.
Yes, its been a long few days. Looking forward to getting the vx up and running like a champ.