Texas.Gov Payments General Maintenance

Notice to Operators: RRC Online Payments will be unavailable Thursday, May 7, 2026, from 9:30 PM CT to 10:00 PM CT. During this time, customers using RRC applications will be unable to process online payments through Texas.gov payment services and will be redirected to a maintenance page and unable to complete payments until after the maintenance is complete.

LP-Gas Vehicle Conversion Manuals

Use the links below to view or download a PDF copy of LP-gas vehicle conversion manuals. AFRED developed these courses and manuals for the Propane Education and Research Council, under PERC Docket 17243.

Converting Vehicles to Propane Autogas

Part 1: Installing Fuel Tanks and Fuel Lines (PDF)

Part 2: Installing Underhood Components (PDF)

Part 3: Installing and Operating Dispensers (PDF)

Part 4: Troubleshooting Four Current Autogas Fuel Systems (PDF)
Off-Road Applications of Propane Engine Fuel (PDF)