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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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