Just bought a 1845c. Bought it knowing there were a few issues. When I first looked at it, it wasn't starting. Seller figured out it was out of diesel. Started after that a few times. Motor ran good when started. Now not starting. Today I tried to bleed the fuel system. Used the lifter pump and cracked the bleeders on the injection pump. There is diesel there. After the pump there is no flow. Crank the engine and no diesel after the injection pump. I'm just learning about diesels. What should I look for with the injection pump?