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9.6 ME - SFI (ME1.0)   >  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. 3.2 - 3.6 bar Check fuel pumps: 34 1.0 , 34 2.0 , Replace 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 Replace diaphragm pressure regulator. 3.0   Fuel system internal 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 1.0 , 36 2.0 , Replace diaphragm pressure regulator or O-rings on diaphragm pressure regulator. 1) Observe Preparation for Test, see 31 .