How to judge the failure of the carburetor accelerator pump

Many drivers will often encounter this situation: the motor vehicle that drives for a day is always good and everything is normal. When you can leave early the next morning, you can't start a car. Checking the ignition system, cleaning the breaker, and adjusting the gap do not work. Observe that there is a fire in the high-pressure cylinder line and check that the oil level in the oil passage and the carburetor float chamber are normal and continue to start. The engine still cannot start. Replacing the capacitor and ignition coil still does not help.
After careful inspection, it was found that the fault was on the carburetor acceleration pump. The process is as follows: First, observe whether the connecting pin (plunger type) or governor nut (diaphragm type) of the carburetor throttle acceleration pump rod falls off. Then, remove the air filter, use a cardboard box to form a small paper stick, insert the throat, the other hand toggle the throttle lever, take out the paper stick, if the paper stick is not wet, indicating that the acceleration pump is not When the oil is discharged, remove the accelerating nozzle screw. Use a fine copper wire to gently dial the check valve weight, and then dial the throttle throttle lever. If the fuel is still not injected, it indicates that the accelerating pump bowl is damaged or the oil passage is blocked. If oil is ejected, the check valve will wear out and replace the check valve. This is because the non-return valve wears tightly after being worn and the mixture is enriched. This not only increases fuel consumption but also makes it difficult to start the vehicle.

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