first look at the injector pump and locate the manual primer button , they have a spring in them so when you unscrew the button it should pop up . Fill the fuel filter with diesel and replace it to the housing bracket . Loosen a bleeder at the fuel filter housing and pump the bulb to remove air once that is done push fuel one hose at a time to the injector pump from there the engine has to be turned over to push air out of the pump and lines. Cracking the injectors lines slightly will help release air also. good luck