DIESEL TANKS ARE EMITTING BUBBLES, USUALLY DUE TO HIGH-PRESSURE GAS IN THE CYLINDER COOLING WATER PASSAGE. THE REASONS AND ELIMINATION METHODS FOR GAS CHANNELS ARE AS FOLLOWS.1. THE TORQUE TIGHTENING OF BOLTS AND NUTS IS NOT IN ACCORDANCE WITH REGULATIONS. IF THE TORQUE IS TOO SMALL AND THERE IS NO PRESSURE, HIGH-PRESSURE GAS FROM THE CYLINDER WILL ENTER THE CHANNEL. ACCORDING TO THE PROVISIONS OF THIS LAW, BOLTS AND NUTS SHOULD BE TIGHTENED WITH TORQUE AND PERIODICALLY TIGHTENED AGAIN.2. THE CYLINDER GASKET HAS BEEN USED FOR TOO LONG, CAUSING IT TO BREAK OR BURN, SEAL, AND RESULT IN AIR LEAKAGE. REPLACE WITH A NEW CYLINDER GASKET.3. THE SURFACE OF THE CYLINDER HEAD IS ROUGH OR DEFORMED, RESULTING IN AIR LEAKAGE. THE GRINDING CYLINDER SHOULD BE LEVELED OR REPLACED.4. IMPROPER ASSEMBLY RESULTED IN CYLINDER SHOULDER FRACTURE AND NATURAL GAS. METHOD: NEW CYLINDER LINER ACCORDING TO THE RULES.5. THE SHOULDER HEIGHT IS NOT ENOUGH OR THE BODY IS TOO DEEP IN THE SHOULDER WELL, CAUSING THE CYLINDER LINER TO FIT INTO THE BODY AND EXTEND OUT OF THE BODY PLANE. EVEN IF IT SINKS, NATURAL GAS WILL FLOW FROM THE SHOULDERS TO THE WATERWAY. AS A RESULT, CHECK THE QUANTITY BEFORE ASSEMBLY AND ENSURE THAT THEY ARE WITHIN THE ALLOWABLE RANGE.