Onan Generator - QG 4000i DF Onboard RV Generator - 4,000 Watts - Gas or Propane - Preorder

$4,101.03

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COMING SOON! Onan QG 4000i DF RV generator with dual fuel operation for Gasoline EVAP and propane applications, using EFI, a variable-speed engine, and inverter technology. 1-800-940-8924 to order Cummins Onan generators part number CM66GR or order online at etrailer.com. Free expert support on all Cummins Onan products. Great prices and Fastest Shipping for Onan Generator - QG 4000i DF Onboard RV Generator - 4,000 Watts - Gas or Propane - Preorder. Generators reviews from real customers.

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Cummins Onan Generators

COMING SOON! Onan QG 4000i DF RV generator with dual fuel operation for Gasoline EVAP and propane applications, using EFI, a variable-speed engine, and inverter technology.

Highlights

Available for Preorder: Reserve yours now and we'll ship it as soon as it's in stock.
Dual-Fuel RV Installations: Gasoline EVAP and propane support fits more onboard fuel setups.
Higher Onboard RV Power: 4,000 watts run more camping and travel essentials off shore power.
EFI Fuel Delivery: Electronic Fuel Injection replaces carburetor tuning during RV travel.
Load-Matched Engine Speed: Variable-speed operation adjusts output as RV demand changes.
Inverter Output for RV Loads: Inverter technology improves power quality for onboard electronics.

Features to know about

Coming Soon for Built-In RV Power

This Onan QG 4000i DF is designed as an onboard RV generator, giving RV owners a built-in power source for camping, travel, and time away from shore power. With 4,000 watts of output, it is sized for more capable RV power needs than smaller onboard units, while still staying focused on RV applications rather than whole-home backup use. This model is listed as coming soon, with availability expected in September 2026.

Dual-Fuel Setup for RV Fuel Flexibility

RV fuel systems can vary by coach, installation, and owner preference. This dual-fuel configuration supports Gasoline EVAP and propane applications, giving RV owners flexibility when matching the generator to their onboard fuel setup. That makes it a strong option for RVers who want built-in power without being limited to a single fuel type.

EFI Operation for Modern Fuel Delivery

Electronic Fuel Injection gives this generator a more modern fuel delivery system than older carbureted designs. For RV owners, EFI helps support consistent generator operation across changing travel conditions, reducing the need for carburetor-style adjustment concerns.

Variable-Speed Design for Changing Loads

RV power demand changes throughout the day as appliances, chargers, fans, and other equipment cycle on and off. The variable-speed engine design allows the generator to adjust operation based on demand, helping support better fuel efficiency and a more refined operating experience compared with fixed-speed generator behavior.

Inverter Technology for Improved Power Quality

Modern RVs often include electronics, appliance controls, battery chargers, and other connected loads that benefit from cleaner generator output. This model uses inverter technology and is designed to improve power quality, making it a good match for RV setups where stable onboard power matters.

Specs

Power:

Watts: 4,000

Fuel:

Fuel type: Gasoline and propane
Dual fuel configuration: Supports Gasoline EVAP and propane applications

Emissions:

Compliance: Meets all US emissions standards for 50-state compliance

Availability:

Expected availability: September 2026

A079R893 Cummins Onan Generator - QG 4000i DF Onboard RV Generator - 4,000 Watts - Gasoline or LP - EVAP and CARB Compliant - 4HGLDA-8313A

Item # CM66GR

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Replacement Onan Generator for a Older Onan MicroLite 4000
Hey Beth! The Onan Generator - QG 4000i DF Onboard RV Generator - 4,000 Watts item # CM66GR is indeed designed to replace your Onan MicroLite 4000. However, it's not going to be as simple as a plug and play swap out. You will be able to reuse your existing mounting base, and 12v power cables. You will not need a new Onan remote panel, however if your connectors are different you will need to splice the new generators wiring into the older remote harness. The functions for the harnesses...
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Recommended Cummins Onan Exhaust Kit for a QG 4000 Generator 4KY-26100R
Thanks for the information Glenn! The Cummins Onan Exhaust Kit item # CM85FV is the correct one for your Onan Generator - QG 4000i DF Onboard RV Generator item # CM66GR. The Cummins Onan Exhaust Kit item # CM85FV is designed specifically to fit the Onan QG 4000i DF generators. It has a 1-1/4" outer diameter, is 21-7/8" long overall, and has a 90° bend which drops down 3-1/2" from where it connects to the generator. I attached a diagram below that will show you the dimensions of the Cummins...
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Can Onan QG 4000i Run 15000 Btu RV Air Conditioner
Hey Jason! Yes, the 4,000W output from the Onan QG 4000i DF Onboard RV Generator # CM66GR is plenty for your 15,000 Btu RV AC. You'll still want to manage your other high draw appliances while the AC compressor is starting, but you won't have any trouble using this to keep the RV cool when you're off grid. What kind of Class C do you have?
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Replacement Generator for a Cummins Onan 4KY-26100R
Hey John, thanks for the picture! The Onan Generator - QG 4000i DF Onboard RV Generator item # CM66GR is a comparable replacement for your Cummins Onan 4KY-26100R. They have the same physical footprint, weight, 4,000 watt power output, and electrical connections. The exhaust ports are in identical locations on your Cummins Onan 4KY-26100R and the Onan Generator - QG 4000i DF Onboard RV Generator item # CM66GR as well so you won't have to worry about rerouting it. You will need to reroute...
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Should I Run Onan QG 4000i Generator on Gasoline or Propane
Hey Scott! I would run the Onan QG 4000i DF # CM66GR on gasoline if your motorhome already has a convenient fuel supply for the generator. Then you still have propane available as a backup, which is one of the big advantages of this model. Propane is also nice if the generator is going to sit for extended periods since you don't have gasoline sitting in the fuel system. Either way, you aren't locked into a single fuel source with the # CM66GR. How often do you typically use your generator?
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What Is Advantage of EFI on Onan QG 4000i Generator
Hey Mike! I would definitely choose the EFI setup on the Onan QG 4000i # CM66GR over an older carbureted model if you're buying a new generator. You don't have a carburetor to deal with, and the EFI system automatically manages the fuel delivery instead of relying on a traditional carburetor setup. The # CM66GR also gives you the newer inverter and variable-speed design. What generator do you have now?
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Info for this part was:

Written by:

Alex H

Updated by:

Michael B

Updated by:

Cody B

Edited by:

Anthony G

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