I'm leery of doing anything hinky to the fuel system except for short test situations. I would put it back to how it was before it got messed up (i.e. stock). I rescued mine from the tweakers and boy did they mess it up good. I have to redo the entire thing, switch, hard lines and all, so I understand your hesitancy. But it is 40ish + year old plastic & rubber, etc fuel line were dealing with and sub par, hack job stuff doesn't belong with it. Replace your rubber at the least. Safety paramount.