2. When disassembling the pipeline of high-pressure system device, the nozzle and valve port must be cleaned and sealed to ensure cleanliness and no dirt during assembly. 3, mixer installation is reliable, no air leakage, explosion-proof cup is not loose, no air leakage. Otherwise, the power is poor, the idle speed is unstable or the vehicle is difficult to start. 4. For oil-to-gas vehicles, the parts of the high-pressure system that have been dismantled during maintenance, such as jackets, connectors, valves, instruments, etc. Before installation, it should be blown twice with high-pressure gas. After assembly, it must be checked for leakage. Before leaving the factory, the whole vehicle should be checked for leakage. 5, pressure reducer vertical and parallel to the longitudinal beam installation, fixed firmly. The circulating water pipe, low-pressure meter line and air inlet hose should have no bending dead angle, do not interfere with other components, and have enough safe distance, and the distance from the exhaust manifold should be ≥100 mm ... 6. Filter element and high-voltage electromagnetic air inlet pipe filter screen should be replaced once every four months. One is to prevent the pipeline from being blocked, and the other is because the automobile modified by natural gas has high pressure (20mpa) and large flow rate at the first-stage valve port of the pressure reducer. The tiny particles and sundries in the gas are easy to cause erosion damage to the valve core of the pressure reducer, which affects the sealing performance of the first-stage intake valve and leads to the failure of the seal, and the first-stage pressure increases, which not only makes the mixture rich, but also directly affects the driving safety of the vehicle. 7. Shijiazhuang cng control loop oil-to-gas power supply insurance must effectively overload the 5a fuse, and the wiring harness must not be exposed, with reliable insulation and isolation protection. 8. The circuit of the original car is not allowed to be exposed. During maintenance, strictly check the insulators of high and low pressure wire plugs, connectors and wires to prevent poor short-circuit (grounding) contact. Strictly check the leakage, insulation, moisture and fixation of ignition high-voltage lines and cylinder lines to avoid leakage and flashover of high-voltage lines. Starter dust cover is intact and effective. The circuit harness of the whole vehicle shall not overlap or entangle with the natural gas pipeline. 9. It is forbidden to repair defective or damaged high-pressure pipelines and ferrule joints, and only new parts can be replaced. The used pipe end must be cut off with a special pipe cutter, and the reaming must be removed, and it is not allowed to be reused.