filling valve leakage When filling valve with a tight oil seat at the end between the copper (or nylon) sealing gaskets. Rupture, deformation, or filling valve at the end of tightening tight, filling the top of the high-pressure valve cavity oil will be below the low-pressure phase is communication, which can not produce high-pressure diesel injection pump.

     oil return valve leakage Multi-cylinder fuel pump valve settings back to the purpose of the oil is to give upper level of injection pump, diesel oil to around 100 kPa pressure. If oil return valve and the valve seat wear, rust Tong, valves culvert Dianqi, or to the oil and to the plunger sets into the mouth of diesel oil pressure dropped, or inhalation of air injection pump, resulting inability to work or even diesel automatic flameout.

     pump putter and hub of oil spills When the plunger pump with the putter had very bushings wear, or putting on the ring damage, and the leaked fuel will increase significantly. If the vent hole plug, which will be part of diesel fuel pump oil into the tank.