But if the pump has been manually moved out of position, it won't be in alignment. I think that's the problem.
With the TB off and the rest of the stuff at TDC, set the pump with the lock hole. Just turn it clockwise (in normal wear direction), insert the pin, and install the belt. That's all it needs to be aligned since the rest is already at TDC. Do not loosen the gray hub on the pump! But you can remove the sprocket, just not the hub.
With the TB off and the rest of the stuff at TDC, set the pump with the lock hole. Just turn it clockwise (in normal wear direction), insert the pin, and install the belt. That's all it needs to be aligned since the rest is already at TDC. Do not loosen the gray hub on the pump! But you can remove the sprocket, just not the hub.