Will Onan Cummins Diesel Generator CM94RR Work At 8,500 Elevation In Colorado?
Updated 08/15/2025 | Published 07/16/2025
Question:
We spend our summers in southwest Colorado and often boondock above 8,000 feet. Our current generator gets grumpy in the thin air. Will this one handle the elevation? 2019 Newmar Canyon Star 3927 Toy Hauler
asked by: Mark A
Expert Reply:
Absolutely, Mark and Wendy.
The Onan 6000 watt generator # CM94RR is an onboard diesel unit with a 3-cylinder liquid-cooled engine that’s designed to auto-adjust for elevation. It performs much better at high altitudes than most gas generators, especially when paired with a load-sensing inverter-charger. At 8,500 ft you won’t see a major difference in performance, and no rejetting is needed.
Just add a winter diesel additive if you’re up there during cold snaps. We’ve seen rigs run this generator at 10,000 ft in Colorado with no issues.
As a side note, you may be able to get a high elevation jet kit for your generator if you let me know what you have.
Product Page this Question was Asked From
Cummins Onan Quiet Series Onboard RV Generator - 6,000 Watts - Diesel
- Generators
- No Inverter
- Diesel
- 6000 Running Watts
- Fixed Mount
- 120 Volt Output
- Electric Start
- Cummins Onan
more information >
Continue Researching
- Q&A: Cushioned Pin Box Recommendation for 2017 XLR Thunderbolt 422AMP,
- Q&A: Is It Easy To Do My Own Maintenance On Onan Cummins Generator 6,000W CM94RR?
- Q&A: Will Triple Axle Hanger Kit # APTT5 Work with Leaf Springs E64SR
- Q&A: Is Cummins Onan 4000w Generator or Inverter model better for Forest River RV with Victron Inverter?
- Q&A: Will the Furrion Chill Cube Work w/ the Cummins Onan QG 4000i Onboard RV Generator?
- Q&A: Will a Furrion Chill Cube RV Air Conditioner Fit the Some Cutout as a Dometic AC?
- Q&A: Availability of Heat Strip or Heat Pump for Furrion Chill Cube RV AC
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Calculating Portable Generator Power Needs
- Article: Choosing the Right Suspension Kit for Your Truck and Trailer
- Article: The Ultimate RV Camping Checklist for Your First Year RVing
- Article: 30-Amp and 50-Amp RV Service: What's the Difference?
- Article: Best Bike Racks for Electric Bikes
- Article: The 5 Best Trailer Drop Hitches You Can Buy
Andrew N.
8/15/2025
Hey Mark and Wendy, did you get a chance to try out the Onan 6000 watt generator at high altitudes? I'm curious to know how it performed for you, especially since it’s designed for those conditions. Let me know how it went, as it could really help others who camp in similar spots!