• The rear supply-port plug is located towards the rear of engine on the high-pressure rail.
It’s purpose is to allow high-pressure oil to flow into the high-pressure rail.
• During engine operation, a small gap remains between the rear supply-port plug and the stand pipe. The force of the hydraulic pressure keeps the stand pipe seated into the branch tube.
• The plug will assure that the stand pipe remains in place when the engine is shut off and not operating.
