Right from TM9-819A, Pressure is a low 3-¼ to 5 psi. There are a couple of bleed holes in the pickup line after the original in tank pump. One is right at the pump, which will not be an issue unless you let the fuel level get low. The other is right at the top of the pickup line, and this one will be a problem. You have to plug it with something or your pump will pick up the path of least resistance and pump mostly air.
I ran my truck with a 24V external pump for the first winter. Come spring I was able to run a gallon of acetone through the tank which cleaned it up to near perfection, and returned to the original in tank fuel pump, like the Gods intended. If you do run acetone, make sure you remove the fuel pump first, or it will turn the rubber mounts and the bottom plug into goo.
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