The International DT466 engine is known for its reliability and power. However, like any diesel engine, the fuel system can experience issues. Understanding the DT466 fuel system and how to troubleshoot common problems is crucial for keeping your truck on the road. While a complete DT466 fuel system diagram is best found in a service manual, this guide will cover key components and troubleshooting steps, focusing on bleeding the fuel system.
One common issue is air intrusion into the fuel system, which can prevent the engine from starting or cause rough running. A faulty check ball under the primer pump cap (often marked with a “+”) can be a culprit. This check ball prevents fuel from flowing back to the tank. If it’s bad, pumping the primer won’t draw fuel.
Testing for leaks in fuel lines and fittings is crucial. A simple method involves using a regulated air supply (around 10 PSI) connected to the fuel tank’s vent hose. Pressurizing the tank helps pinpoint leaks. This technique can also be used to bleed the fuel system.
With the tank slightly pressurized (no more than 10 PSI), open the bleed screw on the fuel filter housing. If no fuel emerges, there might be an internal leak in the standpipe, a problem with the fuel pickup in the tank, or a leak in the fuel lines or fittings leading to the tank. External fuel leaks should be readily visible.
Once fuel reaches the filter header, the next step is to bleed the air from the injection pump (IP). This process also benefits from a slightly pressurized fuel tank. Using the bleed screw on the IP, allow trapped air to escape until a steady stream of fuel flows. Consult your International DT466 service manual for the precise location of bleed screws and recommended procedures. Remember, understanding the function of each component in the DT466 fuel system, from the tank to the injectors, is essential for effective troubleshooting. A properly bled fuel system is critical for optimal engine performance and reliability.
