Practical methods for rust and moisture prevention of diesel fuel tanks during vehicle sea transportation storage

Vehicle roll on/roll off or container shipping has a long cycle, with high humidity and heavy salt spray inside the cabin. The inner and outer walls of the diesel fuel tank are prone to rusting and condensation problems. Once moisture is mixed into the fuel, it can cause filter blockage and fuel injector damage upon arrival at the port, bringing additional maintenance costs to overseas customers. Proper rust and moisture prevention measures for the fuel tank should be implemented at all stages before packing, during shipping, and before arrival at the port. Before packing, priority should be given to internal control of the fuel tank. Do not fill the tank with diesel fuel, and maintain a suitable fuel level of about one-third. Full tank fuel is prone to leakage due to thermal expansion, and empty tank space can accumulate a large amount of humid air to form condensation. If conditions permit, a small amount of compliant anti rust and moisture-proof fuel additives can be added to suppress inner wall oxidation. At the same time, thoroughly drain the accumulated water at the bottom of the fuel tank, open the drain valve to clean the deposited impurities. Many rusts are caused by long-term soaking of the inner wall by accumulated water. The external protection of the fuel tank is also crucial. First, check whether there is any paint damage to the welds, corners, and fixed bracket positions of the tank. Apply salt spray resistant anti rust primer and topcoat to the exposed metal positions. Spray a thin layer of anti rust agent on the bolt and joint positions to avoid the oil outlet and vent hole and prevent blockage of the pipeline. The vent valve is the key to moisture prevention and cannot be directly sealed. After sealing, abnormal pressure inside the fuel tank will cause deformation. It is recommended to use a breathable and waterproof vent cap to block seawater moisture from entering the tank. Carefully inspect the aging cracks of the pipeline interface and sealing ring, replace the sealing components that are resistant to seawater corrosion, wrap the interface position with moisture-proof protective film, and do not wrap it too tightly to affect pressure relief. When fixing the container, avoid the fuel tank body from being tightly attached to the ship or container steel plate, reserve ventilation gaps, reduce condensation adhesion caused by low temperature cabin walls, and avoid binding points on the fuel tank body to prevent damage to the protective coating caused by compression and collision. During sea transportation, try to minimize the impact of severe temperature differences and do not arbitrarily block the breathable structure of the fuel tank. After unpacking upon arrival, conduct a re inspection as soon as possible to check for rust spots and leakage marks on the outside of the fuel tank. Loosen the bottom drain plug and take a sample to check if the fuel has turned white and emulsified. If there is a mixture of oil and water, the fuel tank must be emptied and cleaned before adding new oil. Many export manufacturers only focus on engine and chassis protection, neglecting moisture and rust prevention of the fuel tank. They wait until there is a fuel system failure in the port to deal with it, which not only delays delivery but also affects reputation. This set of operation threshold is not high, suitable for standardized execution of bulk vehicle exports, using simple pre protection to reduce the risk of overseas acceptance and initial vehicle failure.