1995 GMC Yukon Owner's Manual - Page 290

NOTICE: If there is water in your diesel fuel and the weatherwarm or is humid, fungus and bacteria can grow in fuel. They can the damage your fuel system. You'll need a diesel fuel biocideto sterilize your fuel system. Your dealer can advise if you ever you need this. If your fuel tank needs to be purged to remove water, see your dealer or a qualified technician. Improper purging can damage your fuel system. Running Out of Fuel (Diesel Engines) If the engine stalls and you think that you've run out of fuel, do this: First, open the fuel filter air bleed valve. Briefly crank the engine and have someone watch the bleed valve. If there is air, then you are probably out of fuel. To restart your engine: 1. If you're parked on a level surface, add at least two gallons of fuel. However, if you're parked on a slope, you may need to add up to five gallons of fuel. 2. With the air bleed valve open, turn your ignition key to START for 10 to 15 seconds to crank (but not start) your engine. Wait one minute between intervals of cranking to allow the starter motor to cool. Overheating the starter motor could damage it. Keep doing this until you can just see some clear fuel at the air bleed valve. (If, duringthis step, the engine starts, turn the ignition off and close the valve before restart.) 6-8