QSB 4.5 NOT START

[Mohanad]

Hello

I have problem with QSB4.5 after we replace one injector , the engine not start just cranking .

we check the engine by Insite there is no fault.

we do all these below:

1- replace ECM
2- replace fuel pump
3- replace both speed sensor


engine still not start after we do all above ,

we have power on ECM.

I NEED YOUR ADVICE TO FIX THAT