I don't understand why some flip that line, all your doing is making more area for the fuel to get in, it will clear the dist. if you set it up right, its harder running the holley dual inlet line with low profile intakes, i'm sure you can figure something out, i would too get rid of the glass filter, you more then likely have issues in the tank with blockage or in the factory lines, your starveing the fuel pump, i had this happen once, how you can check it (how i ckecked mine) is i pulled off the line from the inlet side of the pump, then install a short hardline & about 2 ft. or so of hose & blew the line to see how hard is was to push all the fuel back in the tank, thats when i realized it was badly clogged, just something to try if the gas cap trick doesn't work.