Every time I bleed the fuel system on the fuel filter housingwith the truck running, I have lots of air shoot out then bubbly fuel. I have replaced the o rings for the return system with some orings from lowes. The injectors are dry with no apparent leaks. I have checked all the lines to and from the tanks and replace most of the hose clamps. Could the air be entering the system because my tank switch does not work? I am running on the rear tank. The front tank fuel does not draw fuel. The air in the fuel causes the truck to buck at low speeds and idle rough.

The truck idles up real high sometimes after I goose it then shift. Air related problem?

Any advice would be greatly appreciated.

Thanks in advance.