Detroits have fuel shutoffs the same as everything else. The air flapper is simply an emergency shutdown to cut off the air. The reason they're perhaps somewhat more prone to running away is mostly due to their unit injector fuel system. Each injector has it's own rack attached to considerable linkage attached to an externally mounted governor. Long story short... it's not that difficult to have it stick or hang up on something.... or be seized if it's sat long enough. When you compare them to a common Roosa pump, they are quite complicated... likewise most inline pumps with hydraulic injectors are compact with the critical parts contained in one housing. A Cummins PT system is regulated by simple pressure... so all of these systems have more fail safes generally speaking. Detroits also have a nasty habit of building up oil in the blower boxes and flipping the blower seals.... so they run off on their own oil. Sometimes the only shutdown is CO2.... or extinguishing the oil supply.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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