I have started to notice a gas smell up front (nowhere near rear, and
thankfully just re-did fuel lines back there in Feb) And its primarily
after the tank is full...

I cannot see any gas seepage or leaking...I am wondering if there is a
seal on top of the tank that is allowing the gas to vent out the fumes
when I am driving....
 
Best place to start? Pull the tank down? How involved operation is
this? I just dropped a 100 gal tank on my motorhome a month or so ago
and boy what a PITA!!!

Any suggestions appreciated...

Thanks!

Dave 
85 gl "Baby Bus"