bit of a strange one. i,ve rebuilt a kit cat with a 2.0 silver zetec. had it running 18 months ago on a 1.8 ecu. been back in the garage and wont start new starter, new 2,0 ecu DESK. cylinder 1,4 keep filling with fuel on prime 1/4 inch deep. 2,3 get a little fuel in not as much. engine cranks and good spark. after cranking over with spark plugs out fuel starts to fill the cylinders. any advise would be much appreciated even wrong advise as i,ve run out of ideas.