Check the fuel filter restriction by measuring the pressure drop across the fuel filter using the following steps. NOTE: The fuel inlet and outlet are labeled on the fuel filter head using text or arrows. Figures do not necessarily display the true orientation of the inlet or outlet of the fuel filter. Fuel Pressure (Filter… Read More »
Rear gear train engines use a dual fuel filter system. • The pressure side fuel filter is used for filtration only and is pressurized by the gear pump mounted on the engine’s fuel pump. NOTE: Some applications utilize a chassis-mounted pressure side filter. • The suction side fuel filter is a fuel/water separator and is… Read More »
Front Gear Train Do not bend, pry, or kink the fuel drain lines during installation. 1 Install the fuel drain line from the fuel pump. 2 Install the fuel drain line from the fuel rail pressure relief valve. 3 Install the fuel drain line from the injector drain port at the rear of the cylinder… Read More »
Inspect the fuel drain lines for clogging and pinched areas. Check the connectors for cracks, wear, or pinched areas. Replace the fuel line if damaged. Inspect the face of the banjo connectors for sealing surface damage. Replace the fuel line if damaged.
Front Gear Train Mark the location of all clips and routing of the fuel drain lines to ensure they are replaced in the correct location during assembly. Do not bend, pry, or kink the fuel drain lines during removal. 1 Remove the fuel drain line from the fuel pump. 2 Remove the fuel drain line… Read More »
The fuel drain lines contain low pressure fuel. All engines have fuel drain lines as follows: 1 From the high pressure fuel pump 2 From the fuel pressure relief valve located in the fuel rail 3 From the injector return port in the cylinder head Directions for service of a two-button quick-disconnect fitting: Remove the… Read More »
Operate the engine at cranking or low idle and measure the fuel pressure. Observe the reading on the gauge. If the fuel drain line restriction is too high: • Check the OEM fuel lines to the tank for proper size, leaks, bends, or clogs. • Check the fuel tank vents for plugging.
Front Gear Train Remove the banjo bolt from the fuel return line located on the right side of the filter head (1 ). Install the banjo bolt, Part Number 4918413, in place of the banjo bolt. Install CompuchekTM fitting, Part Number 3824842, into the banjo bolt. Attach a fuel pressure gauge to the CompucheckTM fitting.… Read More »
Front Gear Train This test checks for air leaks in the fuel supply lines. If all components are functioning properly, the fuel lines after the lift pump will always have a positive pressure. Any poor connections in lines will result in an external leak and not air in the fuel. NOTE: This tool does not… Read More »
The replacement of fuel supply lines, fuel filters, fuel pump, high-pressure fuel lines, and injectors will let air into the fuel system. Air in the system can make the engine hard to start, run rough, misfire, produce low power, or can cause excessive smoke and a fuel knock. A few bubbles exiting the line during… Read More »