Fuel line diagnostic

I have a 2000 kw 900 with a c-15 cat. I removed all my fuel lines and installed a new transfer pump. Now I can’t get fuel to flow. Truck was running fine prior to me messing with it. If I take the return line off fuel filter housing and pump the helllout of it with hand pump I can get a dribble once in a while. Does any one have a diagram of fuel lines? I must have mixed them up somehow under the sleeper where T fittings are. The line fittings appear to have different sizes so hard to mix but here I am. How can u tell which line coming out of tank is pulling and witch one is returning?

 

The pump has two different size lines also so hard to mess that up. I can’t get any traction with the hand pump. Just tried a different hand pump and still nothing. If I take Filters off and fill them the pump will take a little of that fuel and push it through the head then dry up. This is a first start of an inframe and I don’t really want to use starting fluid. There is fuel in the tanks. There is a Y junction where the lines come out of the tanks and splice into the line going to the engine. Maybe it makes a difference how those lines tie together. Maybe a one way valve and I have the lines King the wrong way.

 

Thanks for asking. It helps others to share the solution of a problem
I worked around the problem. I was stressing a bit with the no start because it was the first start on a complete in frame. Replacing the fuel lines should have waited until after I had it running. But I eventually tightened down all lines and gave it s shot of either and it fired up. The hand primer pump still won’t pull fuel from the tanks. If I fill the filters it will push fuel through the head but that’s all. I replaced everything including the secondary filter housing back to the tanks But I have put 16000 miles on engine so far with no issues. It runs like a champ. C-18 cam and c-16 injectors give it an edge on a hill and of course a nice plume of black smoke going through the gears!! Move over Junior!!