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What is the normal voltage for a car fuel pump?

2 Answers

Gollum

08/28/25 5:44am

Car normal fuel pump voltage is 350 volts. The following is an introduction to the fuel pump: Fuel pump composition: Among the four wires of the car fuel pump, two are fuel level sensors (commonly known as floats), one is for power supply, and one goes to the fuel gauge; the other two are fuel pump wires, one for power supply and one for grounding. The fuel pump has a large working current, so the wires are thicker, while the sensor wires are thinner, making them easy to distinguish. Function of the fuel pump: It is to draw gasoline from the fuel tank and deliver it through pipes and the fuel filter to the float chamber of the carburetor. Thanks to the fuel pump, the fuel tank can be placed at the rear of the car, away from the engine and lower than the engine. There is no fixed replacement cycle for the fuel pump. Generally, after about 100,000 kilometers of driving, the fuel pump may show abnormalities.

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AriannaRose

09/10/25 4:08am

After driving for so many years, I believe the normal voltage for a car's fuel pump is generally around 12 volts. This is the standard voltage for automotive electrical systems, but slight fluctuations are allowed in practice, such as within the range of 11 to 14 volts being considered normal. If the voltage is too low, below 11 volts, the fuel pump might not turn, leading to insufficient fuel supply, difficulty starting the car, or stalling. Once, my car wouldn't start, and testing showed the voltage was only 10 volts—it turned out the battery was old and depleted. Conversely, if the voltage exceeds 14 volts, the pump may overheat and wear out faster. I recommend that average car owners get a simple multimeter to check the fuel pump circuit, focusing on the fuse, loose wiring connections, or whether the alternator output is stable. During regular maintenance, ask the mechanic to check the battery's health to prevent the risk of breaking down midway. Don't underestimate this small issue—it directly affects the smooth operation of the engine. Safety first!

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