1. Peform periodic maintenance to the car, fuel filter will become too dirty if not replace following the maintenance schedule.
2. Did not use original parts.
3. Bad performance of the fuel injector.
Suggest to repair at workshop, repair procedure as below:
1. Firtly use a professional inspection tool to test if the fuel supply pressure meeting the car manufacturer requirement.
2. Check the root cause if the fuel supply pressure is too low, check if the fuel supply hose is leaking.
3. Check the fuel filter if it is too dirty, suggest to use original parts.