unless you have a concourse type car I would fit a fuel pump re wire kit off the likes off matt lewis.

lets face it you could buy an expensive rare relay for it to fail in x amount of time or worse it dont work when you get it.

im constantly re wire pumps on many cars not just fords. They suffer with volt drops and high resistance at the best of times. 1v lower at the pump could cause a whole load of crap when tuning.