The fuel tanks on the 74 series tractors have problems with debris collecting in the bottom of the fuel tank. A quick check is to remove the input fuel line from the tank to the first fuel filter at the front right of the engine and let it flow into a clean bucket. If the fuel does not flow the full of the fuel line then the outlet in the bottom of the tank is clogged. Quick fix is to take an air gun and blow that fuel line back into tank. Permanent fix is to drain the fuel tank and take both outlets out of the bottom of the fuel tank and clean the debris out. To bleed the system: 1) Each fuel filter(s) has a bleed screw on top of it. Loosen the screw on the top of the closest fuel filter to the fuel tank and let fuel flow until there are no more air bubbles, close this screw and repeat for next fuel filter. 2) There are no bleed screws on injection pump but loosen one of the injector lines at rear of injector pump, put STOP/START/RUN lever in Start position, pull throttle 3/4 open and then attempt to start the engine. Do Not run starter for more than 60 seconds at a time and let starter cool and try again. If engine fails to start, try pressurizing the fuel tank with air gun while cranking starter.
PS my brother's 684 had the remains of a lady bug in the fuel tank that caused similar problems.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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