Cummins Westport natural gas engines can operate on CNG, LNG, or
biomethane which meet Cummins published fuel specifications.
Customers should note that pipeline natural gas fuel quality can vary on a regional and seasonal basis. LNG fuel quality may change if it is held in storage for extended periods of time. Consult your fuel provider on a regular basis to ensure that natural gas fuel quality, in particular, the methane number, meets engine requirements.
The minimum methane number requirement for the C, B, B Gas International, and L Gas Plus engines is 65 or greater.
The ISL G requires a minimum methane number of 75 or greater.
To ensure the fuel you are using meets the required specifications, we've provided an online calculator for your reference.
This specification covers the natural gas fuel requirements for the following Cummins Westport automotive spark ignited natural
gas engine models:
ISL G •
L Gas Plus •
C Gas Plus •
B Gas Plus •
B Gas International (BGI)
To use this online calculator, fill in the Fuel Composition values so that the total equals 100%.
The Results will be calculated automatically. Methane Number, Lower Heating Value, and
Sulfur Content criteria must be met to pass a given fuel for a specific engine.
Contact your Cummins Westport representative for complete details on the fuel standard and fuel
testing specifications.
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