Hi, see this post for 674: http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=684134
Start from scratch again, Shut off the fuel at the tank, take the fuel line off at the banjo fitting at the front of the injection pump(don't drop the 2 brass washers), turn on fuel and see if there is good fuel flow. Should come out the full of the pipe. Make sure the Banjo bolt is not clogged. Turn off fuel, re-connect fuel line but don't completely tighten Banjo bolt, turn on fuel and let fuel run until there are no air bubbles then tighten Banjo bolt. Next loosen all 3 injector lines at the rear of the pump, set the STOP/START/RUN Control to START, set throttle to 3/4 open, slightly pressurize the fuel tank by using a clean cloth wrapped around an air compressor air gun stuffed in the filler hole of the fuel tank, now start cranking the engine with the starter. DON'T CRANK FOR more than a minute at a time or starter will over heat. FUEL should dribble out loosened injector lines. Tighten 1 or 2 injector lines and see if tractor will fire. If no fuel comes out loosened injector lines have to suspect pump is clogged.
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