Disconnect the fuel return line at the pump. If the motor runs ok with this line off then the line is plugged. O-rings in the pump can deteriorate over time and the debris goes back to the tank. If the debris accumulates at an elbow, splice, or check valve it can plug the line. An engine with this pump will not run if pressure starts to build in the return line.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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