Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
ALT/GAS Fuel Switch (CNG & LPG)
The ALT/GAS fuel switch allows driver to select which fuel vehicle will operate on. The ALT/GAS fuel switch is located on instrument panel and ALT/GAS fuel switch indicator is incorporated into ALT/GAS fuel switch. The ALT/GAS fuel switch only operates when vehicle is at a stop with ignition off. Once ignition is turned on, ALT/GAS fuel switch will not change fuel operating mode. If switch is moved while vehicle is running, gaseous fuel system will not automatically change fuel operating mode and no damage to vehicle will occur.
With ignition off, prior to starting vehicle, determine which fuel you intend to use and press ALT/GAS fuel switch. When selector switch is placed in GAS position, engine will operate in unleaded gasoline mode. When switch is placed in ALT position, engine will operate in gaseous fuel mode so long as temperature and pressure conditions are correct for operating on CNG or LPG. A Green indicator light will illuminate on fuel selector switch to indicate that vehicle is operating in gaseous fuel mode (CNG or LPG). The ALT/GAS fuel switch sends a signal to compuvalve requesting ALT fuel mode, when placed in ALT position. If no signal is received by compuvalve, fuel system defaults to base gasoline mode.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.