Hi Bill, before looking at the injection pump using a clean bucket remove the fuel line from the fuel tank at the input to the first fuel filter and let it run into the bucket. The fuel should flow the full of the fuel line pipe for 5 minutes. If this dosen't happen try taking fuel tank cap off but most likely there is junk in the bottom of fuel tank clogging the outlet. My brother had a dead lady bug in the fuel tank of his 684 and it would act the same way. Runs short of fuel injection pump govenor gives the pump more fuel but there isn't any causing missing and then some fuel arrives and govenor is now full throttle so over fuels hence black smoke then govenor compensates for over throttle.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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