Oh my. Yeah that is the cause. Clearly this is something you need to decide if you are comfortable doing. If you are a plumber then this is nothing new but the only difference is this is a fuel line.
I am attaching a picture of a repair kit that basically you cut out the rusted line and splice in this new line. Otherwise you have to replace the entire fuel line and I would do each of those lines where the rust is. So to replace all those lines, that is a pretty extensive repair.
If you feel good about using this type of repair line then I would go for it because the principal is no different then repairing a drain line that has a crack in it. You don't cut the walls open and replace the entire pipe. You cut out the crack and use two connections and put a new piece in.
Let me know if you have more questions on this.
Image (Click to make bigger)
Sunday, August 9th, 2020 AT 6:31 PM