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What are the symptoms of low fuel pressure in a car?

2 Answers

LaRyder

08/29/25 3:33am

The symptoms of low fuel pressure in a car are: 1. Insufficient driving power; 2. Sudden stalling; 3. Fuel pump failure. The normal fuel pressure value is between 300 to 350kpa. The reasons for insufficient fuel pressure include: 1. Poor injector sealing; 2. Damaged fuel pressure regulator; 3. Clogged fuel inlet filter; 4. Poor contact in the fuel pump circuit. The method to test fuel pressure is: 1. Turn on the ignition switch without starting the vehicle; 2. Remove the fuel pump relay and use a dedicated jumper wire to connect the fuel pump circuit; 3. After starting the vehicle, connect the fuel pressure gauge to check the engine's fuel pressure value.

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MaverickDella

09/10/25 8:12am

Last time I was driving, I noticed the car was particularly hard to start—it took several attempts to get it going. It felt like the fuel pressure was low, which was really annoying. During acceleration, the car was sluggish, with a delayed response when pressing the gas pedal, as if it was dragging something. Additionally, the engine would shake at idle, almost like it was shivering. In severe cases, the car might suddenly stall while driving, and the engine warning light on the dashboard could come on. This isn't just a power issue—low fuel pressure leads to uneven fuel injection, causing the spark plugs to burn incompletely, and over time, it increases fuel consumption. It's important to check the fuel pump or filter for clogs right away.

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