What is the reason for the fuel tank switching switch not working in the Auman EST?
3 Answers
It may be caused by a damaged fuel tank switching valve. Here is some related information about Auman: 1. Appearance: The Auman engine is the Foton Cummins ISGe5-400, with a box length of 9.5 meters, a body width of 2.5 meters, and a body height of 3.77 meters. 2. Power: The Auman engine has a total vehicle weight of 12.66 tons, a rated load capacity of 18.21 tons, and a maximum speed of 100 KM/h. 3. Features: Auman is China's first European standard high-quality heavy-duty truck, fully developed by Foton Daimler Automotive using Daimler's quality management system across the entire value chain. The product features low fuel consumption, high comfort, high safety, and high reliability, and has been certified by Germany's TUV Rheinland, receiving the "European Standard" certification.
After driving the Auman EST for so many years, I've encountered the fuel tank switching valve malfunctioning several times. The most common issues are aging of the switch itself or rusted contacts. Located in the truck cab, the button is frequently pressed and over time tends to get stuck or oxidized, resulting in signal transmission failure. Wiring problems may also occur, such as blown fuses or loose connectors. During long-distance drives in rainy weather, moisture intrusion can corrode the connections, rendering the switch unresponsive. Additionally, the control module might be affected by interference; unstable battery voltage can cause switching failures. While driving, pay attention to any unusual sounds or sticking sensations. If the switch doesn't respond, avoid forcing it to prevent damaging internal components. It's advisable to pull over immediately, check the dashboard for warning lights, and gently wiggle the switch. If that doesn't work, seek professional repair services promptly, as prolonged neglect can affect fuel efficiency and driving safety.
As someone who frequently repairs heavy-duty trucks, fuel tank selector switch failures are quite common. The main causes include wear and tear of mechanical components, circuit open or short circuits, or relay malfunctions. During diagnosis, I first use a multimeter to test if the switch output is normal, then check whether the fuses are intact, especially the circuit box near the co-driver seat, which is most prone to issues. Sometimes, loose or poorly connected wiring plugs need to be reinserted. It's also necessary to inspect the fuel pump and tank sensor, as their misalignment can cause switch commands to fail. Always turn off the engine before testing to avoid electrical spark risks. Owners can check for cracks or a sticky feel on the switch casing themselves, but internal components require a professional technician, especially since Auman's electronic control systems are quite sophisticated, and DIY disassembly might worsen the problem.
