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For the usual burner, the pump is designed to supply oil from 0.75 gph to 3 gph. That is gallons per hour, by the way, to avoid confusion. The limited suction is such that it will not lift as a water pump does but will pick only two or three feet of head. Because of this, it is best to arrange for gravity feed as I have done with mine. An added attraction is that a pump junked by the burner man is usually fit for coolant work. The pump is considered a failure if the built-in pressure regulator doesn't deliver a steady 100 psi. The lathe man could care less. Thus, a unit can usually be had for nothing -- a lovely price indeed.
My setup has the last 15" of delivery tubing made of plastic with a core of No. 14 copper wire, the use of which allows me to shape the tube to the desired point of delivery. The wire is of course a very loose fit in the tube, and the flexibility of copper gives the desired result of easily aiming the coolant at the needed point.
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