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The fuel supply from the tank to the Injector Pump is gravity fed, there is no electric fuel pump booster. (the image is of the Injector Pump on the JD850)

I'm working on a 1986 John Deere 850 tractor with a 3 cylinder Yanmar engine. The owners said it wouldn't start after not running it for a number years. I removed the fuel tank, thoroughly washed it out, replaced all fuel lines, including the returns, replaced the fuel filter and O rings...