Fuel Delivery and Air Induction: Service and Repair

VENTING INJECTION SYSTEM


Venting fuel filter




1. Release union screw (3) at fuel filter.




2. Release knob on hand feed pump and operate this pump until clear fuel (containing no air bubbles) emerges from union screw. Now tighten union screw again.


Venting injection pump

3. Operate hand pump until bypass valve at injection pump opens (audible rattling sound).

4. Retighten knob on hand feed pump.

Note: This forces the pump piston against a sealing ring and seals the hand pump off from atmosphere. If knob is released during operation, hand feed pump will leak, allowing air to enter fuel system.

5. Run engine and check whether all connections are tight.