I believe we had a little misquoted or miscalculated number for the required flow for the injection pump on a 4020. What I see on the NE test about the max fuel use in ..gallons per hour.. (GPH) is 6 plus something lets just call it 7 per hour. A pint of flow per minute at 8 pints to a gallon calculates to 7.5 gallons per hour. You do need to add in some extra flow for pump and injector return but I believe that is only a small percentage of the GPH used by the engine. One gallon per minute is 60 GPH, the 3 gallons per minute suggested is 180 GPH, I am not even sure if black smoke rolling tractor pullers use that much. In my opinion if he can produce a pint a minute or to be safe a pint and a half a minute he should have plenty of fuel flow. Carbureted cars used to have a required pumping spec out of the fuel pump by cranking the engine with the starter a certain length of time. I do not know if a 4020 repair manual contains such a spec.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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