2003 Ski-Doo ZX Series Factory Shop Manual, Page 79Get this manual
Section 03 TROUBLESHOOTING Subsection 03 (FUEL AND OIL SYSTEMS)
SYMPTOM CONDITION TESTINSPECTION
ENGINE LACKS FUEL (OR LEAN MIXTURE)NORMAL USE1Check fuel filter ball located in fuel tankBall must move freelyaCorrosion due to oxidation at installationReplace fuel filter2Check if lines are perforated, kinked, or if they leak at fittingsaLines are too big for their fittings or are improperly routedReplace or properly relocate lines3Check fuel pump outlet flowaDirt clogging fuel pump lines or torn membraneClean or replace fuel pump4Check needle valve on each carburetoraDirt (varnish, foreign particle) clogging fuel line inletsClean5Check main jetaDirt (varnish, foreign particle) accumulation at main jetClean6Check float(s) height in carburetor bowl on each carburetoraLack of fuel at high speed because float height is too lowAdjust float height according to specifications