StaffAllpar HomeMore NewsCarsTrucksUpcomingRepairsTest drives

Patent part of CNG Ram?

by David Zatz on

Chrysler is the only American automaker to make its own natural-gas (CNG) pickups, with GM and Ford both outsourcing CNG conversions. Part of their technology may be a technique for diagnosing fuel injector failures which works with both gasoline and natural gas, without adding much complexity or cost. Patent US008833148, filed by Michigan’s Robert G. Stack and Michael Cottrell, shows how the company achieved those ends.


While Chrysler has a history of making CNG-compatible vehicles in Canada, including large vans, Fiat is better known today for their flex-fuel vehicles, particularly in Brazil, where alcohol is added to the mix of common fuels.

The CNG-capable Ram 1500 automatically switches between gasoline, which it uses during warmup and when the other tank is empty, and CNG. This provides a combination of lower cost and convenience, and also increases the vehicle’s range, since CNG tanks take up much more space than gasoline tanks for a similar range. Thanks, Steven St. Laurent, Marine engineer.

Jeep’s SEMA tease
Ram 1500 TRX: First Drive in the Raptor Slayer

New future for minivans, big cars (updated)

More Mopar Car
and Truck News

Some popular Allpar pages

Dodge Demon

2018 Wrangler JL

Staff details/contactsTerms of ServiceInformation is presented to the best of our knowledge. Plans change and sometimes mistakes are made. Decisions or purchases made based on this site's verbiage or images are done at the reader's own risk. Also see the Allpar News archives, 1997-2008 • Copyright © VerticalScope Inc. All rights reserved. • Mopar, Dodge, Jeep, Chrysler, HEMI, and certain other names are trademarks of Fiat Chrysler Automobiles.