Optiblend : Bi-Fuel Engine

Bi-Fuel Engine Conversion

Power demand in off-grid operations can be high, and operating diesel-powered backup generators can cause higher operational costs, especially now when the US is reeling in a diesel crisis. Bi-fuel engine conversions can allow you to use a cheaper alternative fuel to displace the diesel, lowering your fuel storage and management costs. Additionally, bi-fuel configurations reduce the overall greenhouse gas (GHG) emissions compared to engines that run on diesel alone.

In this article, we will explain what a bi-fuel engine conversion is, how it works, and the results you can expect after a bi-fuel conversion.

What is Bi-Fuel?

Bi-Fuel engine conversion involves modifying or retrofitting an engine to run on an additional type of fuel as well as diesel. Bi-fuel engines can use many different types of gaseous fuels in addition to diesel, including propane, natural gas, LNG, CNG, field gas, etc.

Most people use the terms “bi-fuel” and “dual-fuel” interchangeably, but there’s a slight difference. While they both use two fuel sources, a dual-fuel design refers to a configuration where the engine uses a blend of both fuels.

What Engines Can Use Bi-Fuel?

A bi-fuel configuration is often used on stationary or mobile diesel electric generators. One reason diesel engines are a top choice for bi-fuel applications is their performance. Diesel engines are known for their durability, and diesel fuel provides a high power density.

However, converting the engine using a bi-fuel conversion kit allows for a larger displacement of diesel fuel by natural gas (or other gaseous fuel), thus delivering the same power output as a diesel-only engine while consuming less diesel fuel.

Additionally, bi-fuel engines have a relatively higher transient response, which is an engine’s ability to respond to varying power demands of an operation. Oil and gas applications require optimum transient capabilities that conventional diesel-only engines sometimes struggle to accommodate.

How Does the Conversion Work?

The engine can use diesel or natural gas (or other gaseous fuel), or a combination of the two. While diesel is often stored on-site, the gaseous fuel source is either piped in or stored on-site. The Bi-fuel conversion kit consists of several components, including:

  • Fuel injection system for the diesel fuel
  • Electronic Control Modules (ECMs) for both fuels
  • High-pressure regulator
  • Zero-pressure regulator
  • Manual shut-off
  • Fuel filters (for both fuels)
  • Natural gas sensors

Pros and Cons of Bi-Fuel

Operating a bi-fuel standby generator has its advantages and disadvantages.


  • Reduced diesel consumption due to a larger displacement rate
  • Bi-fuel systems have cleaner emissions
  • Has a higher transient response
  • Lower CO2 and NOx emissions
  • Natural gas costs much less than diesel


  • Gaseous fuel may not be available on a specific site
  • Slightly more complicated air intake system

Does Converting My Diesel Engine to a Bi-Fuel Make Sense?

With the continuing diesel shortage (and the consequent increase in fuel prices), bi-fuel engines can significantly lower your budget for fuel because natural gas is cheaper. Therefore, converting your engine to incorporate a cheaper fuel source makes sense from an economic perspective. Additionally, you’ll reduce your environmental footprint since bi-fuel significantly reduce NOx and CO2 emissions over conventional diesel-only operations.

At OptiBlend®, we provide high-quality bi-fuel conversion kits with a high focus on environmental sustainability and cost reduction. OptiBlend® bi-fuel uses innovative technology that allows your conventional diesel generator to run natural as a supplemental fuel source without modifying the engine’s internal components. As a result, you enjoy cost-saving opportunities, extended runtime, and lower emissions. Contact us today for a quote or more information on our products and services.

  • Bi Fuel Gas Train Bi-Fuel Diesel Engine Conversion - OptiBlend bi-fuel retrofit system uses a gas train & electronic software device to constantly monitor engine performance & gaseous flow for safe & efficient operation.
  • bi-fuel diesel engine conversion Optiblend Bi-Fuel Diesel Engine Conversion - Adding a secondary gaseous fuel such as natural gas, propane, methane or hydrogen extends runtime, lowers operating costs & reduce CO2. ROI happens in weeks, not years.
  • Bi Fuel Gas Train Bi Fuel System Components - OptiBlend bi-fuel retrofit system uses a gas train & electronic software device to constantly monitor engine performance & gaseous flow for safe & efficient operation.

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*calculation assumes 70% displacement, 1 Gallon CNG = 5.66lbs , Diesel Equivelant = 6.384 lbs
**calculations are based on your input data and are approximations