Peake Fuel Solutions ISX15 450ST
Built: 2012 · Series: ISX15
More machines from model year 2012
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Peake Fuel Solutions ISX15 — a Certified Diesel-Natural Gas Retrofit on a Cummins Base
Unlike the identically-named Cummins engine, the SpecCodex entry "Peake Fuel Solutions ISX15" is not a new engine but a retrofit system: Peake Fuel Solutions' "Diesel Natural Gas" (DNG) kit converts a Cummins ISX15 to run on a blend of diesel and natural gas (CNG or LNG). It keeps diesel compression ignition rather than switching to spark ignition as pure natural-gas engines do.
Read on 3 more paragraphs
The EPA certified the kit as, at the time, the only natural-gas retrofit approved for ISX15 engines of model years 2010-2012 rated between 400 and 600 hp. Peak natural-gas substitution reaches up to 70 percent, though the company states 55-65 percent is more typical in practice.
The target audience is long-haul fleets that want to convert existing ISX15-powered tractors to partial natural-gas operation without replacing the whole engine, cutting fuel cost and emissions while keeping the reliability of the diesel base engine.
On a used, converted truck, the documented EPA certification of that specific conversion is essential — only the exact certified engine years (2010-2012, 400-600 hp) and a complete service record for the DNG hardware (gas tanks, injection valves) protect legal compliance and any warranty.
Sources: SpecCodex register, model data: ISX15 (Peake Fuel Solutions), - Heavy Duty Trucking: Peake 'Diesel Natural Gas' Offers Dual-Fuel Conversion, - CCJ: Peake Fuel Solutions releases diesel-natural gas conversion kit, - NGT News: Peake Fuel Solutions Takes 'Diesel Natural Gas' Conversion Kits To Market
Technical data
Engine
| Engine code | 3376; FR10812; 3490; FR10872correct |
|---|---|
| Engine family | CPKEH0912ANQcorrect |
| Engine families | CPKEH0912ANQcorrect |
| Fuel | Bi-fuel 2(CNG/Diesel)correct |
| Rated output | 303.5 kW (= 407 bhp)correct |
| Rated speed | 1,977 rpmcorrect |
| Maximum torque | 1,750 ft·lbfcorrect |
| Speed at max. torque | 1,200 rpmcorrect |
| Operating cycle | dieselcorrect |
| Injection | othercorrect |
| Aspiration | single-stage turbocorrect |
Origin and approval
| Built from | 2012correct |
|---|---|
| Built to | 2012correct |
| Model year from | 2012correct |
| Model year to | 2012correct |
Other data
| Application | HHDDcorrect |
|---|
Frequently asked questions
How much power does the Peake Fuel Solutions ISX15 450ST have?
The Peake Fuel Solutions ISX15 450ST delivers 304 kW.
When was the Peake Fuel Solutions ISX15 450ST built?
Production years: 2012.
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 19 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
ISX15 400
ISX15 400ST
ISX15 425
ISX15 425ST
ISX15 450
ISX15 455EV
ISX15 455MC
ISX15 485
ISX15 485ST
ISX15 500
ISX15 500EV
ISX15 500ST
Sources: US EPA — engine certification data (retrieved August 2026) · How we check the data
Diesel engine in 3D section
Turn the model, look inside and click an assembly — each one is explained.
