Here are some more helpful links for converting to propane or other types of fuels:
http://www.afvtech.com/04/index.asp
AFVTech is a conversion company that performs aftermarket vehicle conversions for natural gas, propane, and hydrogen vehicles. AFVTech also offers mobile service, repair, and safety inspections for OEM or aftermarket alternative fuel vehicle conversion systems in the Phoenix area.
http://www.alternativefuelsequipment.com/
Alternative Fuels Equipment is an exclusive distributor of Analytic Systems, Curtis Instruments, NAVITAS, and Sevcon electronic controls and instrumentation. AFE has led the way in supplying superior electric vehicle products for material handling, industrial, aerial lift, golf, light-on-road, airport and personal mobility applications. AFE can supply your company with innovative products in battery management, motor control, power conversion and instrumentation.
http://65.18.201.32/index.htm
Big Clean Trucks is a vehicle leasing company for clients that want to improve the environmental performance of the transportation links in their supply chains. They lease and maintain alternatively fueled delivery trucks and vans, removing the hassle and headache associated with switching fleets to alternatively fueled vehicles. Big Clean Trucks also maintains and repairs alternatively fueled vehicles at their location in North-central Denver. Maintenance services include natural gas and propane engine repair (both stationary and in-vehicle applications), OEM vehicle/engine dealership support, parts warehousing and supply, and OEM vehicle conversion ship-through programs.
http://www.drvenergy.com/
DRV Energy is a full service alternative fuels center with compressor installation and maintenance, and slow/fast fill stations, including their own small economical compressor skid. In addition, DRV Energy specializes in EPA-approved natural gas and propane port sequential fuel injected kits.
http://www.ecofuel.com/
ECO Fuel Systems specializes in the technology and equipment required in the efficient conversion of gasoline vehicles to cleaner alternatives like natural gas and propane.
http://www.edproenergy.com/
EDPRO Equipment Inc.'s goal is to be the alternate fuels technology leader in the areas of regulatory compliance, customer service and low emissions to specifically targeted fleet platforms in the United States, Canada and other world markets. EDPRO Equipments SEQUIN technology is currently US-EPA certified for use on a 4.6 litre Ford platform.
http://www.parnellusa.com/default.asp
Parnell USA offers an LPG conversion system for many models of vehicles in the DiamlerChrysler line. The conversion system allows the vehicles to run on either gasoline or propane and is composed of four main parts: the regulator, the servo motor, the venturi, and the PCM 2000.
http://www.technocarb.com/
Technocarb is an AFV component supplier and performs aftermarket propane conversions on a number of original equipment manufacturer produced vehicles.
http://www.teleflexgfi.com/index.php
TeleflexGFI is a full system service supplier of alternative fuel systems and components and conversion specialist for natural gas-, propane- and hydrogen-powered vehicles and industrial equipment.