I have an early B7100-D that ive been working on. I cracked the fuel lines at the injectors to prime. When I first started it the engine fired and ran pretty rough and then I could not get it to fire again. I pulled the line after the fuel pump and it works but seems to be weak. It is still moving fuel. im getting no fuel at the injectors now. Any insight? Bad injector pump? or could something after the fuel pump be plugged?