I have a L3400 2004 year model manual lift pump. I GUESS IM NOT GETTING ALL THE AIR OUTbecause I been trying to start it for about 4 months. I replaced lift pump fuel filter and fuel line. I got it to act like it was gonna start 1 time but no go. I have tried installing a electrical pump between filter and manual pump but it's still not getting the air out. I'm getting a good stream of fuel to pump. Any ideas as to what I need to do to get it running.