What are the faults and causes of excessive fuel pressure?
2 Answers
Common causes include: clogged fuel injectors, poor sealing, or fuel spraying in a linear pattern. Common faults: 1. Fuel injector malfunction: Uneven fuel injection or poor atomization, leading to unbalanced power output from each cylinder. Common causes include: clogged fuel injectors, poor sealing, or fuel spraying in a linear pattern. 2. Fuel pressure malfunction: Low fuel pressure results in poor atomization or linear fuel spray, and in severe cases, only fuel droplets are sprayed, reducing the fuel injection quantity and causing the mixture to become too lean. High fuel pressure increases the actual fuel injection quantity, causing the mixture to become too rich. Common causes include: clogged fuel filter; clogged fuel pump screen; insufficient fuel pump capacity; weak fuel pump safety valve spring; deformed fuel inlet pipe. 3. Incorrect fuel injection quantity: Faulty sensors or circuits cause the control unit to issue incorrect commands, leading to incorrect fuel injection quantities and resulting in a mixture that is too rich or too lean, which is an indirect cause of unstable idle. Specific causes include: faulty air flow meter (or intake manifold pressure sensor); faulty throttle position sensor; faulty throttle idle switch; faulty coolant temperature sensor; faulty intake air temperature sensor; faulty oxygen sensor.
A while ago, the fuel pressure in my car suddenly increased, making the engine extremely difficult to start. Several attempts to ignite nearly failed, accompanied by noticeable surging sounds. The main reasons for this issue include several aspects, such as a malfunctioning fuel pressure regulator in the fuel pump, which should maintain stable pressure but got stuck at a high level; or the fuel line being clogged by impurities, like when the filter is severely dirty, preventing fuel from flowing back and causing the pressure to spike. Additionally, faulty sensors might send incorrect signals, causing the fuel pump to overwork. If left unrepaired, these issues not only lead to excessive fuel consumption due to over-injection but may also damage the fuel injectors over time, further deteriorating the car's performance. I later went to the repair shop to test the pressure and replace the faulty parts to resolve the issue. I recommend everyone to pay attention to unusual noises and abnormal fuel consumption.
