The more I think about it, I just now caught what 'Cobra2411' meant. I totally forgot that the trucks use the on frame reservoir to help feed the high pressure pump. We don't have that issue with the cars so it slipped my mind. Since the tank has no baffled reservoir in it, you may run into fuel starvation on heavy acceleration or steep angles if the tank is low. Easy fix is to swap your fuel pump hanger to a later style that has the "module" design with the built in reservoir. You can still install the 255lph pump in the module (a little more work as you have to disassemble the module), but the same result. And you can just leave the frame mounted one there if you want, or bypass it.