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 - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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