Attention! Check the condition of the fuel hoses and pipes in advance. Monitor fuel consumption. If the consumption significantly exceeds the norm, the cause may be damage to the pump diaphragm. In this case, the oil level may exceed the norm, and the oil may emit a gasoline smell.
1. Disconnect the fuel line from the carburetor and insert a tee with a pressure gauge.
2. Start the engine and check the fuel pressure, which should be within 0.18–0.6 atm.
3. After the engine stops, the pressure should slowly decrease.
4. If the engine does not start, turn the starter until the pressure gauge readings appear.
5. If the pressure drops quickly, the pump outlet valve is faulty and the pump should be replaced.
6. If the pressure is too high, check the pump vent for cleanliness.
7. If the pressure is too low, replace the pump, after checking that the hoses are clean and not pinched.