Think this through with me.
It was good for two years, what changed?
Physically VL occurs when liquid gasoline changes it's nature to a gaseous state.
Your fuel pump can't pump gaseous gasoline. Only liquid.
The only things that makes it change state is heat, lots of it.
Find out where heat is coming into contact with your fuel delivery system, metal and rubber lines, fuel pump, etc.
My money is on an exhaust leak.
Is there a reputable muffler shop that can find it for you?