I'm having some fuel problems with my 88 f-150. Its is a dual tank model and the other day I was driving on the back tank and the truck just cut off. I immediately swapped tanks and the truck started right back up and I had no more problems running on the front tank. When I got closer to home I swapped to the rear tank again and in about 5 miles the truck started bucking and running out of fuel. Once again I flipped to the front tank and the problem went away. I was thinking I had lost a fuel pump. Then the next day I drove for nearly 100 miles on the rear tank before I began to have problems. My question is would you say I have fuel pump issues, or a problem with my tank selector valve? I have had some problems with one tank filling the other in the past. Thanks for any insight.