So I think what we're seeing here is that indeed some kits have all their hoses and some don't. Also this is a learning curve , as it should be, to those that have no 1:1 experience with the real thing.
When the major kit manufacturers removed all the text from their instruction sheets and went to pictures only, back in the '70's somewhere, they did a real disservice to all those that would have normally learned from the model building experience. As it was, many kits were built / bashed into things that in the 1:1 world would never run.
Check out the hose placement on this Minicraft Model A V-8 :