I have not tried opening the brass Filter drain valve and cranking the engine. When I open the needle valve to purge the filter housing the engine gets air bound. If the engine went air bound I just fill it from the top of the filter housing by removing the air bleeder cap completely and fill it with a bottle with a nozzle on it as not to run my starter down so much. It seems as though the lift pump is not comming on as it should. What component sends a signal to the lift pump to pressure up the fuel system. there is a water in fuel sensor in the bottom of the fuel filter housing. Is there a fuel pressure sensor in line anywhere.
What does the computer pick up the fuel pressure signal from in fuel system to see the correct pressure.
Your answer is making alot of sense to me and I guess I will have to back check my lines to see where it could possibly be sucking air from between the filter and the fuel tank suction pickup. To me the problem seems to be in that area. I am out of town now and cannot work on my truck at the moment. When I get back in town I will check the system. Thank you for your information I will get back to you when I check for and find the air leak. Tim