1984 Ski-Doo Shop Manual, Page 133Get this manual
SECTION 02 ENGINE
SUB-SECTION 06 (503 ENGINE TYPE)
placeThe aligning marks on the pump casting and on the lever must align If not, loosen the adjuster nut and adjust accordinglyTighten the adjuster nut(TYPICAl) Adjustment nuts
Make sure the tank is sufficiently filledCheck the small oil lines (between pump and intake manifold)If required, fill the lines by running the engine at idle speed while holding the pump lever in fully open position (TYPICAl)