Bleeding the Fuel System

If the engine runs out of fuel, repairs are made to the fuel system, or if air gets into the system for any other reason, the air must be bled out of the fuel system to prevent interrupted unit operation or possibly severe damage to the high pressure fuel pump. Never attempt to purge air and prime the high pressure fuel pump by cranking the engine with the starter.

To bleed air from the fuel system:

1. Reconnect the battery.

2. Place a proper fuel catch pan under the primary and secondary fuel filter location.

3. Turn the unit on. Do not allow the engine to start.

4. Turn the unit on and go to Manual Function Test and select ECU Fuel Relay Test. Run the fuel pump for 1-2 minutes.

5. When the electric fuel pump turns ON, open the bleed screw on the top of the fuel filter head.

6. Air from the fuel system will escape through the open bleed screw. When all the air has escaped, tighen the bleed screw on the filter head.

7. Turn the unit off and clean any spilled fuel. Dispose of fuel and filter according to local regulations.

8. Turn the unit ON and allow the engine to start. Observe the engine run for a few minutes. If the engine fails to start, or starts but stops in a few minutes, repeat the fuel bleeding procedure.

If the engine runs out of fuel, repairs are made to the fuel system, or if air gets into the system for any other reason, the air must be bled out of the fuel system to prevent interrupted unit operation or possibly severe damage to the high pressure fuel pump. Never attempt to purge air and prime the high pressure fuel pump by cranking the engine with the starter.

To bleed air from the fuel system:

1. Reconnect the battery.

2. Place a proper fuel catch pan under the primary and secondary fuel filter location.

3. Turn the unit on. Do not allow the engine to start.

4. From the MAIN MENU, scroll down to the Manual Function Test and select ECU Fuel Relay Test. Run the fuel pump for 1-2 minutes.

5. When the electric fuel pump turns ON, open the bleed screws on the top of the primary and secondary fuel filter heads.

6. Air from the fuel system will escape through the open bleed screws. When all the air has escaped, and a constant flow of fuel is existing the open bleed screws:

   • Tighten the primary fuel filter bleed screw first.

   • Tighten the secondary fuel filter bleed screw second.

7. Turn the unit off and clean any spilled fuel. Dispose of fuel and filter according to local regulations.

8. Turn the unit ON and allow the engine to start. Observe the engine run for a few minutes. If the engine fails to start, or starts but stops in a few minutes, repeat the fuel bleeding procedure.

If the engine runs out of fuel, fuel filters replaced, repairs are made to the fuel system, or air gets into the system for any other reason, air must be bled out of the fuel system to prevent interrupted unit operation or possibly severe damage to the high pressure fuel pump. Never attempt to purge air and prime the high pressure fuel pump by cranking the engine with the starter.

To bleed air from the fuel system:

1. Reconnect the battery.

2. Place a proper fuel catch pan under the primary and secondary fuel filter location.

3. Turn the unit on. Do not allow the engine to start.

4. From the MAIN MENU, scroll down to the COMMANDS MENU.

5. From the COMMANDS MENU, scroll down and select the FUEL PRIMING option.

6. When the electric fuel pump turns ON, open the bleed screws on the top of the primary and secondary fuel filter heads.

7. Air from the fuel system will escape through the open bleed screws. When all the air has escaped, and a constant flow of fuel is existing the open bleed screws:

   • Tighten the primary fuel filter bleed screw first.

   • Tighten the secondary fuel filter bleed screw second.

8. Turn the unit OFF and clean any spilled fuel. Dispose of fuel and filter according to local regulations.

9. Turn the unit ON and allow the engine to start. Observe the engine run for a few minutes. If the engine fails to start, or starts but stops in a few minutes, repeat the fuel bleeding procedure.