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Fuel Shut-Off Solenoid 300743-00149
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Product Overview
Fuel Shut-Off Solenoid is an electromagnetic control valve that cuts off the diesel fuel supply when the engine is shut down, allowing for safe engine shutdown and preventing fuel leakage. The solenoid operates on a 24V DC signal from the ignition circuit: when power is removed, the valve closes and stops fuel flow to the injection pump. This positive shut-off action is what ensures the engine stops promptly and completely rather than continuing to run on residual fuel pressure.
The unit is built with a metal coil and valve body for resistance to the heat, pressure, and vibration of heavy-equipment engine bays, and is designed for direct replacement in the original mounting position without modification.
Technical Specifications
Parameter Specification Part Number 300743-00149 (also 300743 00149 / 30074300149) Type Fuel shut-off solenoid / stop solenoid Voltage 24V DC Construction Metal coil and valve body Mounting Coil connection, direct replacement Operating Environment Resists high temperature, pressure, and vibration Function Cuts fuel supply on shutdown; prevents fuel leakage Compatibility
Machine Model Notes DX300 excavator Primary application DX340 excavator Primary application DX360 excavator Primary application DX520 / DX520LC excavator Listed in fitment data DX530 excavator Listed in fitment data Fitment note: This solenoid is also cross-referenced under part number 3056565. Solenoid connectors and voltage ratings can vary across serial number breaks and engine configurations—confirm the part number and 24V rating on the existing unit before ordering.
FAQ
Q: Is this a genuine part?
A: Yes. This is a genuine replacement part manufactured to the corresponding specification for this reference number.Q: How do I confirm this solenoid fits my machine?
A: Match the part number on the existing solenoid (300743-00149 or 3056565) and confirm the voltage is 24V DC. It is primarily listed for DX300, DX340, DX360, DX520, and DX530 excavators. Do not rely on machine model alone—solenoids in this series can differ in connector type or voltage even when the prefix is shared.Q: What are the signs of a failing fuel shut-off solenoid?
A: Common symptoms include the engine failing to shut off when the key is turned to OFF, hard starting or no-start (if the solenoid fails to open), and intermittent stalling. A failed coil or a mechanically stuck valve can produce either a no-run or no-stop condition.Q: What should I check during installation?
A: Verify that the battery is disconnected, the mounting surface is clean, and the connector pins are free of corrosion. After installation, cycle the key on and off several times to confirm the solenoid clicks and the engine starts and stops normally. Check for fuel seepage at the valve body after the first start.Model names and reference numbers are used for identification and fitment reference only.
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