Hi everyone I've been working on getting my om606 swapped over to a mechanical 603 pump to put in my fj40. I finally have the engine and new ip all put back together but I'm having trouble getting fuel to the injectors. From what I can tell the lift pump is functioning and getting fuel to the filter. The line from the filter to the pump doesn't appear stay primed, it will fill up while cranking but will have air come back into it after cranking it. I'm also having fuel come out the return line. I took the hard injector lines off hoping that would help bleed the air out but it seemed to not make a difference. Is there some else I'm missing like a bleeder screw or something? Thanks!