I now have fuel flowing to my injectors, as I turn over the engine on my b 1700 I get lots of black smoke and a few fire try's but never takes off. The injectors appear to be spraying a good pattern. Engine is turning over fast, battery good, air cleaner good, thr tractor has 445 hrs. on it. I removed exhaust incase of clog found to be good. When turning over I have a slight suction a one point to my exhaust. Did not know if this was a bad valve as a gas engine would be or just normal.All line have been bleed many times, This all started with a rip in my fuel filter and I got dirt through the system. Cleaned all injectors and turned over with line disconected and the injector pump was pumping fuel on all three conections. Any help you can give would be apprecated Rheino