Bleeding the Fuel

Joe steps through the process of Bleeding a Perkins 4-108 diesel engine

Last update 01/26/2009

1. To start off, Turn the Ignition Switch to the ON position. This will activate the electric fuel pump.

NOTE The fuel pump must remain on during this entire procedure. Also make sure that the FUEL
SHUTOFF VALVES are open.

2. Check all connections and hoses for fuel leeks.

NOTE All bleed points in the picture are painted white.

On WINDSTAR the mechanical lift pump is disconnected. The electrical pump performs this
function.

Fuel Cut Off

Primary Filter

Electric Pump

Final Filter
(Starboard side of engine)

High Pressure Pump (Port side of engine)

Injectors

3. Bleed the small BLEED SCREW (1/2" wrench size) on the side of the final filter.

4. Bleed the side BLEED SCREEW (5/16" wrench size) on the high pressure injection pump.

5. Bleed the TOP BLEED SCREEW (5/16" wrench size) on the high pressure pump.

6. At this point attempt to start the engine.
Note Make sure the THROTTLE is open all the way. Make sure the transmission is not in gear.

7. If the engine does not start, bleed the injectors (5/8" wrench size), starting at the AFT end of the engine and working forward.

Leave The Throttle Wide Open And Crank The Engine While Bleeding The Injectors.

Note Do not crank the engine for more than 30 seconds at a time.

8. If the engine still won't start, repeat the process.

Note: Insure That You Are Getting Fuel Without Air Bubbles To All Injectors.

9. Once the engine starts allow it to run for a short time to ensure all of the air is purged from the system and turn the Ignition to OFF and the MASTER SELECT SWITCH to OFF.

Below is a graphic of how the fuel flow is configured on a Perkins 4-18.