leak off

Hi guys so after a lot of pain and hassle I need some real help. My injector leak off pipe was sucking and blowing air creating air locks in system so I replaced with genuine part from merc £75 and now my engine management light keeps coming on still saying fuel injection pump fuel. The car is...

got an injector blowing on my sprinter. did a leak off test just before starting disassembly and found that the blowing injector is fine but injector 2 lifted about 6 inch of fuel in the test tube so i assume its shot. im hoping number 3 (the chuffing one) will survive. but at the least i need...