What are the symptoms of a faulty manual fuel pump in a car?
2 Answers
The symptoms of a faulty manual fuel pump in a car include: 1. Difficulty in starting the vehicle; 2. Engine shaking; 3. Reduced fuel supply from the manual fuel pump; 4. Negative pressure in the fuel tank. When there is air in the diesel engine's fuel passage, such as when starting a new engine, the engine may fail to start. The diesel fuel pump only operates when the engine is running, so it is necessary to use the manual fuel pump to transfer fuel from the tank into the fuel passage. The manual fuel pump is suitable for conveying various types of oil, such as heavy oil, diesel, and lubricating oil. When equipped with copper gears, it can also convey low-flash-point liquids. The various pump types of the manual fuel pump feature a simple and compact structure, are easy to use and maintain, and have good self-priming capability, eliminating the need to fill the pump with liquid before each use.
I've been driving for several years and experienced a faulty manual fuel pump last year, with very obvious symptoms. When starting the car, the engine would crank for a long time before barely firing up, or sometimes wouldn't start at all, especially in cold weather which was particularly troublesome. The idle was unstable while driving, and the car would inexplicably stall a few times at red lights, which really annoyed me. When accelerating, pressing the gas pedal felt unresponsive with insufficient power, making it difficult even to climb small slopes. I also noticed a strong gasoline smell, and upon opening the hood, saw oil stains all over the pump body, likely due to a seal failure causing leaks. During manual testing, the pump felt loose and couldn't draw much fuel. If not repaired promptly, it not only makes driving inconvenient but also wastes fuel and harms the environment, potentially affecting other fuel system components like the filter and causing a chain reaction. In short, if you encounter these signs, don't hesitate—get it checked and replaced by a professional shop immediately.
