1994 GMC Suburban Owner's Manual - Page 256

A CAUTION: Diesel fuelis flammable. It could start a fire if it gets on hot flow engine parts. You could beburned. Don't let too much fuel from the air bleed valve, and wipe up any spilled fuel with a cloth. 3. Close the air bleed valve. 4. Turn the ignition key to "Start" for 10 to 15 seconds at a time until your engine starts. Fuel Filter Replacement (Diesel Engines) If you want to change the fuel filter yourself, here's how to do it: Before you remove the filter, drain any water that may have collected in the fuel filter or filter head. See "Water in Fuel" earlier in this section to find out how to remove water from the fuel system. Then, drain fuel from the filter by opening the air bleed valve and the water drain valve. This prevents the fuel from spilling asyou replace the filter. Drain the fuel into a fuel-resistant container and dispose of it properly. A CAUTION: Diesel fuel is flammable. could start a fire if something ignites It it, and you could beburned. Don't let it get on hot engine parts, and keep matchesor other ignition sourcesaway. 1. Turn off the engine and apply the parking brake. 2. Take off the fuel tank cap. This releases vacuum in the tank. 3. The filter islocated at the rear of the intake manifold. 6- 10