In diesel generator operation, the fuel stop solenoid (also referred to as a fuel shut off solenoid or fuel cut-off valve) is the primary electro-mechanical actuator responsible for starting and stopping the engine. Because diesel engines rely on compression ignition rather than electrical spark plugs, stopping the engine requires a positive physical shut-off of the fuel rack at the injection pump.
Over extended service intervals, stop solenoids operate in demanding environments characterized by continuous vibration, engine compartment heat cycles, and fuel vapor exposure. When a solenoid coil fails or the internal plunger binds due to degraded fuel varnish, generator sets will experience either a “crank-no-start” condition or an inability to execute automated shutdowns.
When sourcing a replacement, ordering based purely on generic engine horsepower or external visual similarity frequently leads to fitment errors. This engineering guide details the field identification, cross-referencing, and verification workflow for three widely used industrial generator stop solenoids: Cummins 3926412, Perkins U85206452, and Kubota 16851-60014.
1. Core Replacement Profiles & Applications
+----------------------------------------------------------------------------------------------------+
| DIESEL GENERATOR STOP SOLENOID CROSS-REFERENCE |
+----------------------+--------------------+---------------------+----------------------------------+
| Stamped Part Number | Engine Application | Available Voltage | Mounting & Linkage Type |
+----------------------+--------------------+---------------------+----------------------------------+
| 3926412 | Cummins Engines | 12V / 24V DC | Flange Mount / Integrated Link |
| U85206452 | Perkins Engines | 12V / 24V DC | Bracket Mount / Governor Linkage |
| 16851-60014 | Kubota Engines | 12V DC | Compact Direct-Fit Body |
+----------------------+--------------------+---------------------+----------------------------------+
Cummins Engine Applications: Part No. 3926412
The Cummins 3926412 Fuel Stop Solenoid is engineered for Cummins diesel generator sets where fuel-rack shut-off controls engine shutdown.
- Applications: Standby diesel generator sets in telecom huts, commercial facilities, and industrial power plants requiring reliable pull-to-run or pull-to-stop actuation. It is widely used in engine overhaul kits replacing gummed or seized stop actuators.
- Electrical & Mechanical Specs: Available in 12V DC and 24V DC configurations with heavy-duty flange mounting and positive plunger return spring mechanics.
- Compatible Replacement: Precision-manufactured compatible replacement for part number 3926412.
Perkins Engine Applications: Part No. U85206452
The Perkins U85206452 Fuel Stop Solenoid is designed for Perkins diesel generator engines across prime and standby power systems.
- Applications: Generator sets and industrial power units where automated governor rack control governs engine stop sequences. Frequently deployed in fleet maintenance programs to replace thermally degraded coils.
- Electrical & Mechanical Specs: Supplied in 12V DC and 24V DC ratings with robust mounting brackets designed to withstand heavy continuous engine vibration.
- Compatible Replacement: Compatible replacement engineered to match Perkins part number U85206452 specifications.
Kubota Engine Applications: Part No. 16851-60014
The Kubota 16851-60014 Fuel Stop Solenoid is a compact fuel cut-off valve engineered for Kubota small-displacement diesel generator engines.
- Applications: Compact standby generator sets, light towers, mobile power units, and engine overhaul kits.
- Electrical & Mechanical Specs: 12V DC operating voltage with a compact body engineered for space-constrained engine compartments and direct-fit fuel pump linkage.
- Compatible Replacement: Precision compatible replacement for Kubota part number 16851-60014.
2. Four Key Verification Steps Before Ordering
To prevent ordering errors, follow this standardized four-step verification process before procuring a replacement solenoid:
+----------------------------------------------------------------------------------------------------+
| FOUR-STEP FIELD VERIFICATION WORKFLOW |
+----------------------------------------------------------------------------------------------------+
| |
| [ STEP 1: STAMPED PART NUMBER ] |
| --> Inspect the metal body casting or nameplate sticker for the stamped part number. |
| |
| [ STEP 2: SYSTEM VOLTAGE CONFIRMATION ] |
| --> Verify whether the generator electrical bus is 12V DC or 24V DC. |
| |
| [ STEP 3: CONTROL TOPOLOGY ] |
| --> Confirm Energize-to-Run (pull-to-run) vs Energize-to-Stop (pull-to-stop). |
| |
| [ STEP 4: MECHANICAL MOUNTING & LINKAGE ] |
| --> Verify bracket hole spacing, mounting thread diameter, and plunger linkage geometry. |
| |
+----------------------------------------------------------------------------------------------------+
- Verify the Stamped Casing Part Number: Always locate the stamped alphanumeric code on the metal casing of the old solenoid or on the injection pump data plate. Stamped numbers like
3926412,U85206452, or16851-60014are the most reliable indicators for component matching. - Confirm DC Operating Voltage (12V vs 24V): Generator control systems operate on either 12V DC (single battery) or 24V DC (series dual batteries). Solenoids of identical exterior dimensions may have different internal winding voltages. Installing a mismatched voltage rating will either prevent plunger pull or cause immediate coil burn-out.
- Identify Control Topology: Diesel stop systems use either:
- Energize-to-Run (ETR / Normally Open): Continuous voltage is required to hold the fuel rack open during operation; cutting power shuts the engine down.
- Energize-to-Stop (ETS / Normally Closed): The solenoid receives a temporary voltage pulse only during the shutdown command to pull the rack into zero fuel.
- For detailed troubleshooting on solenoid wiring and shutdown failures, refer to our Fuel Shut-Off Solenoid Testing Guide and Fuel Solenoid Fails to Stop Engine Guide.
- Inspect Mounting Bracket and Plunger Linkage: Check the physical mounting flange, thread pitch, and linkage connection (clevis pin or ball joint) to ensure smooth mechanical travel without binding against the governor housing.
3. Brand Cross-Reference & Compliance Statement
POPULACE Electronic Co., Ltd. manufactures high-durability compatible replacement parts for diesel generator power systems.
- Compatibility Notice: All replacement fuel stop solenoids supplied by POPULACE are compatible replacement parts and are not OEM components.
- Brand Identification: Reference to brand names including Cummins, Perkins, Kubota, Deutz, and others is made strictly for component identification, technical cross-referencing, and application compatibility. No endorsement, sponsorship, or original equipment manufacturing partnership is implied.
- Cross-Reference Matrix: For a comprehensive overview of cross-referenced generator components across regulators, controllers, and actuators, consult our Generator Parts Cross-Reference Guide.
4. Bench Testing, Warranty & Pre-Dispatch Support
Every POPULACE fuel shut off solenoid is manufactured in our ISO9001-certified facility in Xiamen, Fujian, and undergoes strict quality gate procedures:
- 100% Bench Testing: Every unit is inspected for coil integrity, plunger actuation smoothness, and return spring reliability prior to packaging.
- Certification & Warranty: Certified under CE and ISO9001 standards, backed by a comprehensive 13-month factory warranty.
- Global Inventory & Rapid Delivery: In-stock models ship within 2–3 business days via international air express (DHL, FedEx, UPS, TNT, Aramex) or sea freight.
If you need assistance confirming the correct replacement solenoid for your generator engine, take a clear photo of your old solenoid nameplate and mounting bracket. Our technical support engineers will verify compatibility and provide a formal quotation.
Contact Our Engineering Team for Solenoid Fitment Verification →
