fiesta economic and water watch system

[VG30TT]

Hello, I'm new to this forum.
So I have a fiesta econetic and a water watch system that I was planning to install, I've taken the car to a certified installer only to be told it can't be fitted at the moment with the current fuel lines and connectors.
Has anyone else fitted this unit and what changes had to be made to be able to plumb it in? Any comments will be great thanks.