From bowl to injectors to glo plugs and return lines back to tank. This is the auto bleed system. Been 5 yrs since ive touched it, don’t have access to my manuals, no computer, just phone. The line were in the hands of couple helpers. Would like to go through and route, and go through a start up to check things til I can get a manual. Thank you all for your time and effort, and accepting me to site. Love it