Simms/Minimec pumps require oil changes unless their level and drain ports are plumbed into the engine. I believe some American Bosch pumps are also plumbed to the engine although I'm not certain on that. My experience with the Simms pumps is that most leak at the drain and are empty unless maintained quite frequently..... so I'd expect a bad diaphram in the lift pump if the cambox is full of fuel. Some fuel bypass on the pump plungers into the cambox is normal, but it would not be a lot unless the pump was poor, the drain plug wasn't a leaker or the oil hadn't been changed in a rather long time... I'd change it and see what happens after 10 hours and then go from there.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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