How to Remove Air from the Automotive Fuel System?

[OJosie]

Here are the methods to remove air from the automotive fuel system: 1. Loosen any of the air bleed bolts on the top sides of the fuel injection pump several turns. 2. Manually pump the hand primer pump until the discharged diesel flows continuously, smoothly, and without bubbles, making a "squeak, squeak" sound. 3. Then tighten the air bleed bolt and return the fuel pump to its original position. Below are additional details on air removal: 1. If you are on the road and do not have the appropriate tool to loosen the air bleed bolt on the fuel injection pump, you can loosen any pipe joint between the diesel filter and the fuel injection pump. Use the hand primer pump until the joint discharges a smooth, bubble-free flow of diesel, then continue pumping while tightening the joint. 2. If you do not have a wrench to loosen the pipe joints, you can repeatedly squeeze the hand primer pump until the pressure in the low-pressure fuel line from the fuel transfer pump to the fuel injection pump is high enough. The fuel will then flow from the overflow valve into the fuel return line, and the air in the fuel line will be discharged through the overflow valve.