I just got done rebuilding my motor: new pistons, rings, and bearings. Reason for rebuild was a spun rod bearing. Other than that, the engine was running good. I didn’t do anything with the head or injectors, but I did put a new head gasket on. I put a new fuel filter on and tried to bleed the fuel system, but I couldn’t get fuel up to the injectors. Checked for obstructions in the fuel hoses and tank and all was good. Just to see if it would work, I put the old filter back in and was able to get fuel up to the injectors, but the tractor won’t fire off. There is black smaoke coming out of the exhaust and it acts like it wants to fire off. The air filter and air hose are clear of obstructions. I popped the front cover off to check the match marks on the gears and everything aligned. Would finding a different fuel filter solve the problem, or is there something going on with my injectors? The diesel I’m using is a few months old, but I’ve never had issues with it and it’s kept in a dry space. Any advice would be greatly appreciated.