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 - Antique Tractor Solvents - by Curtis Von Fange. Solvents play an important role in keeping our tractor clean and running efficiently. There are many different types that can be used for external and internal cleaning of the various tractor parts. Being aware of the different types of solvents will make any cleaning job go easier because one can select the correct cleaning agent for the task at hand. Let’s take a quick look at what is available and readily used in the solvent larder of our shop environment. The most universal solvent in
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