1.Grind after disassembly and wash to make it tight.
2. The screw plugs and valve seats of the oil inlet and outlet valves on the grinding press are tightly closed or screwed.
3. Clean the oil filte.
4. Replace ih new oil or release old oil; filter and clean the oil inlet valve, and grind it to make it fit well.
5. Chanthin oil, increase the room temperature in cold weather.
6. Add enough fuel to the fuel tank;
7. Pull out the small piston, inject oil and press again.
8. Replace with a new pump.