The POPULACE XHQ-PT fuel stop solenoid is a diesel engine shutdown control component designed for generator sets, agricultural equipment, and industrial diesel engines. This XHQ-PT engine stop solenoid valve is available in 12V and 24V DC, using a wire rope mechanism to actuate the throttle lever and trigger engine shutdown in under 2 seconds. The XHQ-PT fuel stop solenoid features an auto power-down circuit that reduces holding current to below 15mA after activation, keeping the coil temperature low during standby. With a 90N max tension output and an operating stroke of 53±1mm, the XHQ-PT suits both OEM replacement and new installation across a wide range of diesel engine platforms.

Engine shutdown reliability on diesel-powered equipment comes down to one component: the fuel stop solenoid. In most diesel generator sets and utility engines, the shutdown sequence is triggered mechanically — a solenoid pulls the throttle cable or fuel rack lever into a closed position, cutting fuel delivery and stopping the engine. The POPULACE XHQ-PT fuel stop solenoid is purpose-built for this function, covering applications from small single-cylinder gensets to larger multi-cylinder industrial engines.

When a shutdown signal arrives — from an AMF controller, a manual shutdown switch, or an engine protection circuit — the XHQ-PT engine stop solenoid valve energizes and pulls the wire rope through its full 53mm stroke, actuating the fuel lever. The internal auto power-down circuit then reduces holding current to sub-15mA levels, significantly lowering heat generation between the shutdown command and engine stop. Once the engine halts, the XHQ-PT mechanism auto-returns to standby without manual reset.

The XHQ-PTG variant shares the same electrical and mechanical specifications as the XHQ-PT fuel stop solenoid but uses a slightly different housing that suits certain generator panel enclosure configurations. Both XHQ-PT and XHQ-PTG cover the same 12V and 24V supply ranges and deliver identical field performance.

Dual Voltage Availability: The XHQ-PT fuel stop solenoid is offered in 12V (9–15V DC) and 24V (18–30V DC), covering standard mobile and stationary diesel generator electrical systems without requiring any additional step-down hardware.

Auto Power-Down Circuit: The XHQ-PT engine stop solenoid draws 12V-2.0A or 24V-1.0A on activation, then automatically reduces holding current to under 15mA — significantly reducing coil heat in long-standby applications and extending service life.

Fast Reaction Time: The XHQ-PT fuel stop solenoid completes shutdown actuation within 2 seconds of receiving the stop signal, meeting the timing requirements of most AMF controller shutdown sequences used in commercial genset installations.

Auto-Return Mechanism: After engine stop, the XHQ-PT wire rope auto-returns to the ready position with no manual reset needed between shutdown and the next start cycle — simplifying operation on automated generator systems.

Wide Operating Temperature Range: Tested from -30℃ to +60℃, the XHQ-PT diesel engine shutdown solenoid operates reliably in cold-climate installations and high-ambient industrial settings without performance degradation.

Wire Rope Pull Interface: The XHQ-PT fuel stop solenoid's wire rope output provides direct, positive throttle actuation suited to the mechanical fuel lever designs found on most diesel generator engines, and routes easily in confined engine bays.

The XHQ-PT fuel stop solenoid's most practical engineering feature is its auto power-down circuit. Standard pull-type solenoids hold full coil voltage throughout the entire shutdown event — generating heat and accelerating coil insulation wear. The XHQ-PT cuts this to under 15mA once the plunger has completed its stroke. In generator room environments where ambient temperature is already elevated, this design detail directly affects the service life and failure rate of the engine stop solenoid over time.

At 90N maximum tension, the XHQ-PT fuel stop solenoid covers most small-to-mid-size diesel engine throttle mechanisms, including common Asian-manufactured genset engines from Yanmar, Kubota, Changchai, and similar engine families. The XHQ-PT wire rope interface is also mechanically simpler to route in confined engine bays compared to rod-type solenoids, making installation and replacement faster for service technicians working on site.

The XHQ-PT engine stop solenoid is manufactured under ISO-certified quality control, with each unit inspected before dispatch. POPULACE has supplied generator components since 2006, with active distribution across Asia, the Middle East, and Africa — markets where diesel generator reliability is critical for daily operations.

The POPULACE XHQ-PT fuel stop solenoid suits a range of diesel-powered shutdown applications:

Diesel Generator Sets: The XHQ-PT engine stop solenoid provides primary fuel shutdown actuation for standby generators in commercial buildings, telecom infrastructure, data centers, and industrial facilities — integrated with AMF or manual controller stop output.

Agricultural and Construction Equipment: The XHQ-PT fuel stop solenoid handles engine stop function on diesel tractors, excavators, skid steers, and other equipment using mechanical throttle-wire shutdown mechanisms.

Marine Diesel Engines: The XHQ-PT fuel shutoff solenoid provides shutdown actuation on small and mid-size marine diesel propulsion engines that retain mechanical fuel rack access for direct wire rope interface.

AMF and ATS Panel Integration: The XHQ-PT engine stop solenoid valve works directly with automatic controller modules requiring a dedicated fuel stop output for managed, fully automated generator shutdown sequences.

OEM Parts Replacement: The XHQ-PT and XHQ-PTG serve as direct replacements for original solenoids across multiple diesel engine brands and equipment configurations, with no modification needed in most swap-out scenarios.

For distributors and service contractors managing diesel generator fleets, the XHQ-PT fuel stop solenoid offers broad compatibility and consistent performance. Dual 12V and 24V versions of the XHQ-PT cover the majority of the installed genset base, and the wire rope interface makes it a straightforward swap on most mechanical fuel systems without additional adapter components.

POPULACE offers factory-direct pricing with 2–3 day dispatch on stocked XHQ-PT fuel stop solenoid units. The 13-month warranty covers manufacturing defects and is supported by online technical assistance for wiring and installation queries. For parts buyers managing cross-brand service inventories, the XHQ-PT and XHQ-PTG represent a single sourcing decision covering a wide range of diesel engine compatibility — a practical choice for service parts planning across agricultural, construction, and standby power applications.

Q1: What is the difference between the XHQ-PT and XHQ-PTG fuel stop solenoid?

Both the XHQ-PT and XHQ-PTG share the same electrical specifications, operating stroke, and wire rope pull mechanism. The XHQ-PTG fuel stop solenoid uses a different mounting housing geometry that suits certain generator control panel enclosure configurations. Functional performance in the field is identical across both variants.

Q2: Does the XHQ-PT diesel engine stop solenoid work with electronic governor systems?

The XHQ-PT fuel stop solenoid actuates mechanical fuel levers via wire rope pull and is designed for engines with a dedicated mechanical fuel shutoff point. For electronically-controlled fuel injection engines, confirm that a mechanical shutdown cable path is still present before selecting the XHQ-PT engine stop solenoid.

Q3: How does the XHQ-PT fuel stop solenoid connect to the generator control circuit?

The XHQ-PT engine stop solenoid typically connects to the stop output terminal of an AMF or manual shutdown controller. Full wiring diagrams are included with each XHQ-PT unit, and online technical support is available for installation queries.

Q4: Is the XHQ-PT fuel stop solenoid suitable for cold-climate installations?

Yes. Rated to -30℃, the XHQ-PT generator fuel shutoff solenoid performs reliably in standard cold-climate generator room conditions, including outdoor enclosures in northern climate zones where other solenoid types may experience sluggish response at low temperatures.