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9.3 ME - SFI (ME2.0)   >  32 Hydraulic Test Program - Test (Fuel System Pressure and Internal Leakage Test)

Test scope Test connection Test condition Nominal value Possible cause/remedy 1) 1.0   Fuel pressure at idle (with vacuum) Pressure gauge connected to test connection. Engine: at Idle Valve on pressure gauge closed. 3.7 - 4.2 bar Check fuel pumps 34 , Diaphragm pressure regulator. 2.0   Fuel system internal leakage test Pressure gauge connected to test connection. Engine: OFF After 30 minutes > 3.0 bar > 2.5 bar If the pressure drops quickly: Replace check valve in fuel pumps. If the pressure drops slowly: check injectors, see: 36 1.0 , 2.0 , Replace diaphragm pressure. 1) Observe Preparation for Test, see 31 .