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1. Check the cylinder pressure of the gasoline engine to remove the spark plug, plug the spark plug hole with your fingers, and crank the crankshaft. If it is easier to shake and it feels like the rebound of the compressed gas is not great, the seal of the cylinder is poor, resulting in insufficient compressive force. 2. Check that the plunger-type fuel delivery pump, such as the No. II fuel pump, is equipped with a push rod-type oil delivery pump, which can be placed in the oil basin for oil absorption test. That is, the thumb is used to block the oil outlet and the other hand presses the push rod. If the thumb cannot be blocked and the fuel is injected at the oil outlet, the oil pump is performing well. 3, check the plunger parts with the left thumb, index finger and middle finger plug the plunger sleeve top hole, inlet hole and return hole, so that the plunger is in the medium or maximum fuel supply position, the right hand will be the plunger from the vertex position Outside pulling, pull the distance to the plunger does not expose the plunger sleeve oil hole is limited. If the index finger feels suction, once it is released, the plunger can snap back into place quickly, indicating that the sealing performance is good and can continue to be used; if there is suction, but it cannot rebound back to the original position, it indicates that the plunger has stuck; Without suction, new parts should be replaced. In addition, when the engine is in full throttle, hold the high pressure tubing with your fingers. If you feel that the impulse force is strong, it means that the plunger seal is good. Otherwise, the plunger assembly has worn out. 4. Check the connecting part of the oil valve block the lower port of the oil valve seat with the thumb, take out the oil valve in the other hand, insert the diesel oil valve into the seat hole, and gently press down from the top to the minus. Below the pressure ring zone, if there is air compressive force, but no air bubbles emerge, or the pressure is loosened, the oil valve can automatically pop up to reveal the decompression ring, indicating that the oil valve sealing performance is good.