I am having about the same problem. When i bought the truck i used the rear tank in my 94 250 and all of the sudden on my way home everything shut off. Well next day i check spark its getting spark and it fires right up on starting fluid. Well now i cant hear my rear pump but if i switch to the front i can hear it run but im only getting drops of gas to the filter. Does this mean the pump is clogged or a line is clogged?