Removal Procedure
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing
any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to
the vehicle or its components.
- Remove the
negative battery cable(s).
- Remove the fuel from the tank. Refer to
Fuel Tank Draining
.
- Remove the fuel tank. Refer to
Fuel Tank Replacement
.
- Remove the fuel sender. Refer to
Fuel Sender Assembly Replacement
.
- Clean the fuel tank.
Important: The fuel tank should be replaced if the tank is rusted internally.
- Remove the fuel strainer or replace if necessary. Refer to
Fuel Sender Assembly Service
.
- Remove the fuel lift pump. Refer to
Fuel Lift Pump Replacement
.
- Remove the fuel manager/filter. Refer to
Fuel Manager/Filter Replacement
.
- Remove the fuel return line at the injection pump.
• | Use low air pressure to blow out the lines toward the rear of
the vehicle. |
• | Replace the pipes if they are rusted internally. |
- Remove the fuel filter from the fuel manager housing. Refer to
Fuel Filter Element Replacement
.
- Wipe out the inside of the housing with a clean towel.
- Remove the heater element from the housing. Refer to
Fuel Heater Replacement
.
- Remove the water in fuel sensing element from the housing. Refer
to
Water in Fuel Indicator Sensor Replacement
.
- Clean the inside of the filter housing with GM brake parts cleaner
or equivalent.
- Dry the housing completely.
Installation Procedure
- Install the water in fuel sensing element using a new seal. Refer
to
Water in Fuel Indicator Sensor Replacement
.
- Install the heater element with a new O-ring seal. Refer to
Fuel Heater Replacement
.
- Install the fuel filter into the fuel manager. Refer to
Fuel Filter Element Replacement
.
- Install the fuel manager/filter. Refer to
Fuel Manager/Filter Replacement
.
- Install the fuel sender. Refer to
Fuel Sender Assembly Replacement
.
- Install the fuel tank. Refer to
Fuel Tank Replacement
.
- Install the new fuel lift pump. Refer to
Fuel Lift Pump Replacement
.
- Install clean diesel fuel into the tank until it is ¼ full.
- Install the fuel tank cap.
- Install the negative battery cables.
- Remove the ECM 1 fuse from the underhood relay center.
Important: Use a suitable container to catch the fuel.
- Install a hose from the fuel injection pump inlet hose ( hose to hose)
at the fuel injection pump to a closed metal container with a capacity of
at least 8 liters (2 gallons).
- Crank the engine for 15 seconds with one minute cooling
periods until the clean fuel is pumped out.
- Reinstall the inlet hose to the injection pump.
- Install the ECM 1 fuse in the underhood relay center.
- Install a hose from the return line at the fuel injection pump
to a closed metal container with a capacity of at least 8 liters (2 gallons).
- Crank the engine for 15 seconds with one minute cooling
periods until clean fuel appears at the return line.
| Important: Ensure the fuel return line is in the metal container and that the container
does not overflow.
|
• | Start the engine and allow it to idle for 5 minutes. |
• | Remove the hose from the metal container. |
- Reinstall the fuel return line to the injection pump.
- Check for leaks.
- Clear any engine DTCs.
Gasoline in Fuel System
Engine Will Run or Start
- Drain the fuel tank. Refer to
Fuel Tank Draining
.
- Fill the fuel tank to ¼ with diesel fuel.
- Run the engine for 15 minutes.
Engine Will Not Run
- Drain the fuel tank. Refer to
Fuel Tank Draining
.
- Fill the fuel tank to ¼ with diesel fuel.
- Remove the ECM 1 fuse from the underhood relay center.
- Install a hose from the fuel injection pump inlet hose ( hose
to hose) at the fuel injection pump to a closed metal container with a capacity
of at least 8 liters (2 gallons).
- Crank the engine for 15 seconds with one minute cooling periods
to purge the gasoline from the system.
- Reinstall the inlet hose to the injection pump.
- Install the ECM 1 fuse in the underhood relay center.
- Start the engine.
Important: Check for leaks.
- Run the engine for 15 minutes.
- Clear the engine DTCs.