well there right,ok,your injector has a nozzel and on that nozzel there is a copper washer and if that copper washer is not there or leaking you will get fuel passing throw.after that washer there is a O-ring that seals off fuel from oil and if that is leaking it will have oil and fuel leaking.and so you got this motor from the bone yard.could someone needed some O-rings and take them off the injector?Did you go through the motor be for you put it in?It could be a broken injector cup.what about injector not pushed all the way in and missing hold down bolt.be for starting take out glow plug and turn crank over by hand ,to take out fuel that may be sitting on piston.