Your post is somewhat ambiguous. When you say that you don't know how to route the lines, are you saying that you don't know what lines connect to what point...or are you saying that you simply don't know whether to route a fuel line over or under the engine mount?
If you're trying to build an engine or install one based on pictures off the internet, there's a serious problem. If you're just trying to tidy up line placement, that's another matter.