Injection Problem

[jayhawktrailers.com]

I NEED SOME HELP WITH MY 4BT. IT WILL RUN ON THREE CYLINDERS, BUT WHEN I TIGHTEN DOWN THE FOURTH INJECTION LINE IT WILL DIE. IT WILL ALSO DIE IF I TRY TO REV IT UP. ALL INJECTORS ARE NEW, I HAVE ALSO TRIED TO PUT AN OLD INJECTOR BACK IN, SAME THING. I BOUGHT THE MOTOR AS A REBUILD. THEY WERE SUPPOSED TO HAVE GONE THROUGH THE PUMP. THEY WON'T WARRANTY THE PUMP BECAUSE I BOUGHT THE ENGINE A YEAR AND A HALF AGO. I'VE BEEN DOING THE REPOWER SLOWLY, AS MONEY WILL ALOW. ANYONE HAVE AN IDEA? COULD IT BE OFF A TOOTH AND STILL RUN ON THREE? I TRIED TO POSTED THIS QUESTION ONCE BEFORE BUT LOST MY CONNECTION , SORRY IF THIS WAS POSTED TWICE. HERE ARE THE NUMBERS ON THE ENGINE THE PUMP IS A ROTARY

CPL 0858

ENGINE 3912468

REF S064931

INJECTOR 3912468

THANKS IN ADVANCE