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9.2 ME - SFI (ME2.1)   >  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. 3.2 - 3.6 bar Check fuel pumps 34 , Diaphragm pressure regulator. 2.0   Fuel pressure at idle (without vacuum) Pressure gauge connected to test connection. Engine: at Idle Disconnect vacuum hose from diaphragm pressure regulator. 3.7 - 4.2 bar Diaphragm pressure regulator. 3.0   Fuel system leakage 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 36 , Replace diaphragm pressure regulator or O-rings on diaphragm pressure regulator. 1) Observe Preparation for Test, see 31 .