i am planning out my vent line and my intended route will take it a couple inches below where it attaches to the tank. it will run like that for 15'' and then go to top of cabin, 15'' above tank and at that point attach to antisiphon line and then head to the belly where it will exit. i am familiar with anti siphon, siphoning etc. is there a reason not to allow the vent line below its attach point to the tank? i am sure the low portion of the line will at times have fuel but i don't see any problem. opinions?