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Why is the fuel pump of an EFI motorcycle not working?

1 Answers

MacKate

07/30/25 6:57am

The fuel pump of an EFI motorcycle may not be working due to a damaged fuel pump, issues with related circuits, or potential faults in the ECU and sensors. Below is more information about the fuel pump: 1. Introduction: Among the four wires of an automotive fuel pump, two are for the fuel level sensor (commonly known as the float), one is for power supply, and one connects to the fuel gauge. The remaining two wires are for the fuel pump itself—one for power supply and one as the ground wire. The fuel pump operates with a high current, so its wires are thicker, while the sensor wires are thinner, making them easy to distinguish. 2. Fuel Pump Relay: The abbreviation is PMR, and the full term is Pump-Motor-Relay. The fuel pump relay controls the power supply to the fuel pump. Modern vehicles typically use direct or port fuel injection, and once the fuel supply meets certain requirements, the relay cuts off the fuel pump, thus controlling its operation. 3. Basic Function of Automotive Relays: They act as 'automatic switches' that use a small current to control the operation of a larger current. In circuits, they perform functions such as automatic regulation, safety protection, circuit switching, and more.

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