Ram B1500, B2500, B3500, 1999-2003

Bleeding The Fuel System


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Fig. Location of the low pressure bleed bolt-5.9L diesel engine

  1. Loosen the low pressure bleed bolt.
  3. Operate the rubber push-button primer on the fuel transfer pump. Do this until the fuel exiting the bleed screw is free of air. If the primer button feels as if it is not pumping, rotate (crank) the engine approximately 90°, then continue pumping as described.
  5. Tighten the low pressure bleed screw to 72 inch lbs. (8 Nm).

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    Fig. Operate the push-button primer on the fuel transfer pump until the escaping fuel is free of air


Fuel System Priming

A certain amount of air becomes trapped in the fuel system when fuel system components on the supply and/or high-pressure side are serviced or replaced. Fuel system priming is accomplished using the electric fuel transfer (lift) pump.

  1. Servicing or replacing fuel system components will not require fuel system priming.
  3. The fuel transfer (lift) pump is self-priming: When the key is first turned on (without cranking engine), the pump operates for approximately 1 to 2 second and then shuts off. The pump will also operate for up to 25 seconds after the starter is quickly engaged, and then disengaged without allowing the engine to start. The pump shuts off immediately if the key is on and the engine stops running.
  5. Turn key to CRANK position and quickly release key to ON position before engine starts. This will operate fuel transfer pump for approximately 25 seconds.
  7. Crank engine. If the engine does not start after 25 seconds, turn key OFF. Repeat previous step until engine starts.
  9. Fuel system priming is now completed.
  11. Attempt to start engine. If engine will not start, proceed to following steps. When engine does start, it may run erratically and be noisy for a few minutes. This is a normal condition.
    Do not engage the starter motor for more than 30 seconds at a time. Allow two minutes between cranking intervals.

  13. Perform previous fuel priming procedure steps using fuel transfer pump. Be sure fuel is present at fuel tank.
  15. Crank the engine for 30 seconds at a time to allow fuel system to prime.
    The fuel injection pump supplies extremely high fuel pressure to each individual injector through the high-pressure lines. Fuel under this amount of pressure can penetrate the skin and cause personal injury. Wear safety goggles and adequate protective clothing. Do not loosen fuel fittings while engine is running.

    Engine may start while cranking starter motor.