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Section 10 FUEL SYSTEMSubsection 04 (CARBURETOR)Internal Fuel FilterTo verify condition of filter no. 5, proceed as follows:Remove pump cover no. 16, gasket no. 17, diaphragmno. 18 and then pump body no. 4 and diaphragmno. 19.Remove filter no. 5 from carburetor body thenclean filter and blow carefully with compressed air(low pressure).Replace filter if damaged.– Obstruct outlet nipple with a finger and holdwhile pumping.– Pump tester until it reaches 28 kPa (4 PSI).1 2 3F01F0YATYPICAL1. FilterFuel Accelerator PumpDisconnect inlet and outlet hoses from acceleratorpump nipples.1F06F07A1. Pump gauge tester2. Hose installed to inlet nipple3. Outlet nipple obstructedDiaphragm must stand pressure for 10 seconds.If pressure drops, replace accelerator pump diaphragm.Verify accelerator pump check valves operation asfollows:Connect a clean plastic tubing to the valve inletnipple and alternately apply pressure and vacuum.The check valve should release with pressure andhold under vacuum. WARNINGSome fuel may be present in fuel pump.F06F06A 1 2TYPICAL1. Fuel inlet hose2. Fuel outlet hoseUsing a suitable pump gauge tester, perform thefollowing test proceeding as follows:– Install pump gauge tester (P/N 295 000 083) oninlet nipple of accelerator pump no. 22.F06F08A 1TYPICAL1. Apply pressure and vacuum at inlet nipple10-04-4 SMR2003-032_10_04A.FM