2003 Ski-Doo ZX Series Factory Shop Manual, Page 160Get this manual
Section 04 ENGINE Subsection 06 (OIL INJECTION SYSTEM)
To Bleed Oil Lines
Bleed main oil line (between tank and pump) by loosening the bleeder screw no8 until air has escaped from the lineAdd injection oil as requiredReinstall all partsBleed the small oil line between pump and engine by running engine at idle while holding the pump lever in fully open positionNOTE: Make hook out of mechanical wire to lift the lever
Reconnect small oil lines, start engine and run at idle while holding the pump lever in fully open positionOil columns must advance into small oil linesIf not, remove pump assembly and check the pump gear and drive shaft (if applicable) for defects, replace as necessaryTest pump as describes belowNOTE: Through normal use, oil level must not drop in small tubesIf oil drops, verify check valve operation in injection nozzleReplace as necessaryTest Bench Connect hose filled with injection oil to main line fittingInsert other hose end in an injection oil containerUsing clockwise rotating drill rotate pump shaftOil must drip from outer fittings while holding lever in fully open positionIf not replace pump