12V Fuel Solenoid Fit for Thermo King SLXi 300 Whisper 400-50 Pro-50 Spectrum-50
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
12V Fuel Solenoid for Thermo King SLXi 300 Whisper 400-50 Pro-50 Spectrum-50
This 12V fuel solenoid for Thermo King SLXi 300, Whisper 400-50, Pro-50, and Spectrum-50 refrigeration units controls fuel cutoff to ensure reliable engine operation. It is an aftermarket replacement part designed to match the function of the OEM solenoid in these Thermo King models.
Overview
This 12V fuel solenoid for Thermo King SLXi 300 and related models is a normally-closed valve that stops fuel supply when de-energized and opens when powered. It provides consistent fuel metering for cold starts and safe shutdowns in reefer units. This component suits technicians maintaining Thermo King trailer and truck refrigeration systems.
Built For Performance
- 12-volt continuous-duty coil for reliable engagement
- Sealed coil housing protects against moisture and dust
- High-temperature rated insulation for near-engine mounting
- Precision plunger with low friction for rapid response
- Threaded fittings accept standard fuel line connections
Fits These Machines
- for Thermo King SLXi 300
- for Thermo King Whisper 400-50
- for Thermo King Pro-50
- for Thermo King Spectrum-50
On-The-Job Use
- Replacing a worn solenoid that causes hard starting or fuel leaks
- Rebuilding fuel system during engine overhaul in reefer units
- Troubleshooting no-start conditions in Thermo King units
Specs At A Glance
| Type | Fuel Shutoff Solenoid |
| Voltage | 12V DC |
| Function | Fuel On/Off Control |
| Compatible Models | SLXi 300, Whisper 400-50, Pro-50, Spectrum-50 |
Good To Know
Q: Can this fuel solenoid be used on a Thermo King SLXi 400? A: This part is specified for the SLXi 300 and similar models listed; confirm your unit's model number and engine type before purchase to avoid mismatch.
Q: How do I test if my current solenoid is faulty? A: Apply 12V directly to the coil terminals and listen for a click; if there is no click, the coil is likely burned out, and this replacement is needed.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.