the filters you see on pumps is pressure side filter and generally do poorly in terms of efficiency. Beta is the typical term used for filter efficiency. A beta of 2 means that the filter is only catching half the particles of a given size. Pressure side filters with cellulose media typically have a beta of 3-4. If they would have put the filter on the suction side it's have a beta of at least 10 but very typically closer to 100 or even maybe 500. Dirty filters are more efficient but at the expense of pressure drop which is where your mileage drops are coming from. Hydraulic systems have filters typically downstream of all the pumps/valves, actuators and on the return to tank side.
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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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