What Causes a Fuel Pump Fuse to Blow?

[VanCody]

Possible issues with the fuse or relay. Here are the detailed explanations: Methods: First, verify whether the fuse and relay in the fuel pump control circuit are functioning properly. Then, check if the relay's control signal can operate the relay normally. Next, use a multimeter to test the continuity of the circuit from the relay to the fuse and then to the fuel pump. If the control signals for both the fuel injector and ignition coil are absent, inspect whether the engine speed sensor is working correctly. Note: During high-speed driving, the vehicle experiences significant acceleration. The relay contact arm may deform slightly, making the contacts prone to poor connection due to the vehicle's acceleration. A momentary disconnection of the contacts can generate a large current in the circuit, easily causing the fuse to blow. The effect is even more pronounced during sudden braking at high speeds.