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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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