Q1: What are the main models and applicable scope of 12V diesel engine fuel stop solenoid valves?

Main Models & Corresponding Engines

• 119233-77932 (YM119233-77932): Dedicated to Yanmar small/medium diesel engines (3TNE72, 4TNE84, 4TNE88, 4TNV94), widely used in compact excavators, agricultural machinery, and small generators;
• 26420472/7185-900T: Compatible with Perkins 400-series engines (404D-22T, 1104D-E44T), applied to construction machinery and industrial generators;
• 3991625: A universal model for Cummins low-horsepower diesel engines, suitable for light-duty trucks and generator sets;
• 1503ES-12S5SUC12S (Woodward): High-performance version for heavy-duty diesel engines in construction machinery (e.g., small excavators and loaders), with enhanced durability for frequent start-stop scenarios;
• 1C010-60010/1C010-60013: Specialized for Kubota diesel engines in agricultural equipment (tractors, harvesters) and small construction machinery.

Applicable Scope

• Light-duty equipment: Small generators, agricultural tractors, and compact excavators (matching Yanmar/Kubota engines) for outdoor mobile operation;
• Medium-duty machinery: Industrial generators, light trucks, and small construction equipment (matching Perkins/Cummins engines) for continuous or intermittent working conditions;
• Core application scenarios: Fault replacement (e.g., coil burnout, valve core jamming, fuel leakage) and routine fuel system maintenance, ensuring safe and reliable engine shutdown and startup .

Q2: What is the working principle and core functions of the 12V fuel stop solenoid valve?

Working Principle

• Startup phase: When the ignition key is turned to “ON”, 12V DC power is supplied to the solenoid coil, generating a magnetic field that pulls the internal plunger and opens the fuel valve core, allowing fuel to flow into the injection pump and enabling engine startup;
• Shutdown phase: When the ignition is turned off, the coil loses power, and the internal spring pushes the valve core back to its seat, cutting off the fuel supply and forcing the engine to shut down immediately;
• Fault protection phase: If the coil or circuit fails, the valve core resets under spring force to cut off fuel, preventing engine runaway or prolonged idling .

Core Functions

• Precise fuel supply control: Maintains stable fuel flow during engine operation, with a response time ≤2s to ensure synchronous fuel cutoff with ignition shutdown ;
• Engine safety protection: Prevents engine run-on (post-ignition shutdown) and hard shutdown, avoiding mechanical wear caused by improper fuel cutoff;
• Low-power & stable operation: The standby power consumption is ≤0.5W, and the rated operating current is 2.0A (12V), with no overheating during long-term operation, adapting to continuous working scenarios of generators and construction machinery ;
• ECM signal compatibility: For engines with electronic control modules (ECMs), it transmits shutdown/startup status signals to the ECM, enabling real-time fault monitoring and diagnostic trouble code (DTC) triggering for anomalies .

Q3: What are the key technical parameters of 12V diesel engine fuel stop solenoid valves?