That bleed fitting is needed to remove any trapped air from the filter base, as CAV DPA pumps on Perkins do not have the internal head air bleed passage like some other engines use. If you look closely, the final filter base has both the injection pump supply AND return lines, so both ends of the pump have 4-5 PSI pressure. It's designed that way to help keep air out of the pump, but the system won't work with the bleed orifice plugged. Tractors use one bleed, some combines have two, one on top of each of the double filter base. Another thing to watch for, when the filters begin to plug the fuel return flow will stop, then there's a chance air will enter back through the return side orifice. The injection pump has a vane transfer pump that will try to draw fuel when the supply slows down to less than engine needs. No fuel, means it will draw air..
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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