Hi mates!!!

I need some help about fitting a new fuel pump on my Escort RS turbo S2 `88

I had buy a new fuel pump on "Autospecialist", here is a pic:



But the problem is that I canīt bolt on the out of new fuel pump with a plug of the older fuel pump, I donīt know what it is, maybe a pressure valve or something?? Hereīs a pic:



Maybe the older fuel pump not is the original one for Rst S2 so the new does not fit??
What will I need to fit the new one??

Iīll be waiting for answers..............

Thanks