ALT/GAS Switch

WARNING: This page is about a different car, the 2004 Ford Pickup Heritage. However, it is still accessible from the selected car via links, so may be relevant.

The ALT/GAS switch is located on the instrument panel and allows the driver to pre-select the operating fuel before starting the vehicle. The switch only operates with the ignition switch in the OFF position. If the switch is pressed while the vehicle is running, the input is ignored. The gaseous fuel system will NOT automatically change fuel modes with the vehicle running.

The ALT/GAS switch has two operating positions:

When the GAS position is selected, the engine will operate in the gasoline mode. Selecting the ALT position sends a signal to the alternative fuel control module (AFCM) requesting ALT fuel mode. If the temperature and pressure conditions are correct, the vehicle will switch to the gaseous fuel mode. A green indicator will also illuminate on the switch to verify the vehicle is operating in the CNG mode. If no signal is received by the AFCM, the system defaults to gasoline mode.