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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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