I don't really know if you need it or not, but when I installed my Walbro pump, I took it out. I got the pump for the mustang and the hose that came with it had a couple light bends in it, but it stretched straight and connected with no problems. I soldered my wires and heat shrinked them. Also the mustang sock that goes on the bottom of the pump is straight and sits at a little bit of an angle in the taurus tank but it is not a problem. The taurus sock has a angle built in to let it sit flat on the tank. I have not had any problems with the flat mustang sock.
You can also replace a little rubber duck thing that is on the return line if you want. I didn't.
My original pump was fine, but it wasn't holding pressure when I shut the car off, making it difficult to restart if you didn't prime it a couple times, because the check valve was broke on the pump. When I took it off you could here it rattling around.
I have pictures of my install if you want.
Will