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260 diesel cranks easily. Runs normally for 10-15 mins. Then begins to stumble, nothing I can do with diesel feed will prevent it slowly stopping. Cranks up immediately, but doesn't accelerate. Fuel, air filter new, fuel fresh with cleaner and water remover in fuel. Radiator full, not overheating. Thanks in advance for any suggestions.
There is not a YM260 but all Yanmar tractors should all be fairly similar. My first guess would be fuel starvation. Do you get a good steady stream of fuel going into your injection pump? Be sure you can stream a quart or so of fuel without it slowing or stopping.
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