2003 Ski-Doo REV Series Factory Shop Manual, Page 155Get this manual
Subsection 08
Section 04 ENGINE (CARBURETOR AND FUEL PUMP)
Connecting the Pump, DPM Manifold and Water Column Connect hoses as shown
CAUTION: Never use pump directly on DPM to make pressure testThe vacuum produced by the pump is too high and would damage DPM componentsUse the water column as explained aboveApply negative pressure (vacuum) until the extremities of the water in the tube attain difference of 350 mm (13-34 in)Stop pumping and allow water levels to stabilize in tubeAnalysis If water level remains unchanged, the DPM manifold is not defectiveIf water level drops slowly to return to an even level in more than 10 seconds, the DPM manifold is not defectiveIf water level drops to an even level in less than 10 seconds, the DPM manifold is defectiveReplace DPM manifold parts, (refer to Parts Catalog) and re-testIf test fails again, replace DPM manifoldIf you are unable to attain any amount of vacuum (water level increases and decreases immediately in tube), check your set-up and re-do the testIf you still cannot attain any vacuum, DPM manifold is defectiveReplace DPM manifoldA32C6YA