hey greg its paul, do you have two breathers at the back? if so plum them in as shown

http://www.streetdragster.com/Pages/Zetec%20Turbo.htm

look on this link it will show you two breathers at the back of the block, this is how ive just done mine, plum the 2 into one pipe as shown in one of the pics using a y type piece of as escort water pipe