As Chris mentioned, in essence youve left a gap almost all the way across the part with no mesh hence no flow.  You need mesh in most places especially creating a flow from the resin feed to vacuum side of the mould.  Small bits like the boss's should be fine without mesh as its a small area so will naturally flow into small areas with no mesh but not massive expanses like youve got.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant