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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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