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Take the cover off the injection pump, remove as much fuel as possible and replace with Diesel Mechanic in a Bottle. Move the metering valve back and forth. This valve must move freely.

Good point about keeping the tank topped off. Nothing "removes" water from fuel, the only thing possible is emulsifying the water and protecting from corrosion. With most ultra low sulfur diesel, a small percentage of biodiesel is added to replace lost lubricity. The problem here is biodiesel...