1995 GMC Yukon Owner's Manual - Page 145

Water in Fuel Light This red light will come on towarn you if there is water in the diesel fuel system. For more information on how this light works, see "Diesel Fuel Requirements and Fuel System" in the Index. Service Throttle Soon Light SERVICE THROTTLE SOON On diesel engines, a computermonitors the operation of the electronic accelerator. As a check to show you it's working, this orange light comes on for a few seconds after the ignition is turned on. Normally, it will not come back on unless the ignition has been off for 30 seconds or more. If the light does not come on at all, and the ignition has been off for 30 seconds or more, have the light fixed right away. If the light stays on after the engine starts, or comeson while you are driving, the computer is indicating that your vehicle has a problem. You should take your vehicle in for service soon. 2-73