Injection Pump Housing Fuel Pressure
- Remove injection pump and drain all fuel. Connect an air supply line to fuel inlet fitting. Be sure air supply is clean and dry.
- Seal the return line fitting. Completely immerse pump assembly in a container of clean test oil.
- Apply 20 psi (1.4 kg/cm2 ) to pump. Leave pump immersed for 10 minutes to allow any trapped air to escape. Watch for leaks after 10 minutes.
- If no leaks are noticed after 10 minutes, reduce air pressure to 2 psi (.14 kg/cm2 ) for 30 seconds. If there are still no leaks, increase pressure to 20 psi (1.4 kg/cm2 ) again.
- If no leaks are observed, pump is serviceable. If leaks are observed, pump must be exchanged for replacement unit.