SEAT Workshop Service and Repair Manuals

Checking delivery pressure and quantity for fuel system pressurisation pump -G6- Special tools and workshop equipment required t  Vehicle diagnosis tester t  Connecting nipple -VAS 6551/5-1- t  Hose -VAS 6551/2- t  Hose -VAS 6551/1-

t  Pressure tester (diesel) -VAS 6551- Test prerequisite: l  Fuses must be OK. l  Connect battery charger to ensure sufficient voltage supply of min. 12.5 V. l  Minimum fuel tank level: 15 l l  Ensure that vehicle is placed on a level surface. l  Ensure that fuel hoses and lines in engine compartment and on underbody are not closed through damage (kinks). l  All electrical consumers, e.g. lights and rear window heating, must be switched off. l    Note The vehicle must be fuelled with the diesel fuel appropriate for the time of the year. Diesel fuel sold in the summer time can be used at temperatures down to 0°C, the intermediate seasons, down to -10°C and winter diesel, down to -20°C. The low winter temperatures can lead to the formation of crystals in the petroleum if summer diesel is used. If you are unsure, try and expose it to the low outside temperature for approximately 1 hour. If the fuel coagulates up to -20° C, it is unsuitable for low temperatures. This coagulation can block the strainer in the fuel delivery unit as well as the fuel filter.   WARNING Fuel supply line may be pressurised. Wear eye protection and protective clothing to avoid possible injury and skin contact. Before releasing the connections on the hoses, place absorbent cloths round the connection. Then release pressure by carefully pulling hose off connection. Test sequence for high-pressure pump –  Remove engine cover → Chapter.

–  Open clamp and pull fuel supply line -arrow- off the high-pressure pump. –  Place connecting nipple -VAS 6551/5-1- in supply line and secure with clamp. –  Connect hose -VAS 6551/2- between connecting nipple -VAS 6551/5-1- and connection point »A« of pressure tester (diesel) -VAS 6551-. –  Connect hose -VAS 6551/1- to connection point »B« of pressure tester (diesel) -VAS 6551-. –  Guide open end of hose -VAS 6551/1- into a suitable measurement container. –  Switch on pressure tester -VAS 6551- by pressing On/Off button.

–  Open shut-off taps „A“ and „B“ of pressure tester -VAS 6551- and close shut-off tap „C“. –  Connect Vehicle diagnosis tester and then carry out „Guided Fault Finding, Checking electrical fuel pump(s)“.   Note The fuel pump is now activated for 30 seconds. –  Carefully close shut-off tap „B“ and set pressure of 4.5 ± 0.1 bar.   Note If the specified pressure is not attained, carry out „test sequence for fuel filter“ → Anchor. Reason may be a blocked fuel filter. –  After setting desired pressure, empty measurement container and carry out „Guided Fault Finding, Checking electrical fuel pump(s)“ again. –  Observe pressure on pressure tester -VAS 6551-. –  After controlling pump (30 seconds), read supplied fuel quantity in measurement container. Specification: min. 1,400 ml If the specifications are attained: fuel system pressurisation pump -G6- OK. If the specifications are not obtained perform test sequence for fuel filter → Anchor. Test sequence for fuel filter –  Reconnect fuel supply line to high-pressure pump.

–  Pull off fuel supply line -B-. To do this, press the quick-release couplings onto the connections, press in the locking elements (keep pressed) and pull the quick-release couplings off. –  Connect hose -VAS 6551/2- between fuel line from fuel tank and connection point „A“ of pressure tester -VAS 6551-. –  Connect hose -VAS 6551/1- to connection point „B“ of pressure tester (diesel) -VAS 6551-. –  Guide open end of hose -VAS 6551/1- into a suitable measurement container. –  Switch on pressure tester -VAS 6551- by pressing On/Off button.

–  Open shut-off taps „A“ and „B“ of pressure tester -VAS 6551- and close shut-off tap „C“. –  Connect Vehicle diagnosis tester and then carry out „Guided Fault Finding, Checking electrical fuel pump(s)“.   Note The fuel pump is now activated for 30 seconds. –  Carefully close shut-off tap „B“ and set pressure of 4.5 ± 0.1 bar.   Note If the specified pressure is not attained, carry out „test sequence on fuel filter“ → Anchor. Reason: fuel line may be pinched or kinked. –  After setting desired pressure, empty measurement container and carry out „Guided Fault Finding, Checking electrical fuel pump(s)“ again. –  Observe pressure on pressure tester -VAS 6551-. –  After controlling pump (30 seconds), read supplied fuel quantity in measurement container. Specification: min. 1,400 ml If the specifications are attained: fuel system pressurisation pump -G6- OK, replace fuel filter insert → Booklet If the specifications are not obtained perform test sequence for fuel tank → Anchor. Test sequence on fuel tank

–  Pull fuel supply line (black or black marking) -2- off fuel tank.   Note Press in securing ring to release fuel lines. –  Collect escaping fuel with a cleaning cloth. –  Connect hose -VAS 6551/2- between fuel line and connection point „A“ of pressure tester -VAS 6551-. –  Connect hose -VAS 6551/1- to connection point „B“ of pressure tester (diesel) -VAS 6551-. –  Guide open end of hose -VAS 6551/1- into a suitable measurement container. –  Switch on pressure tester -VAS 6551- by pressing On/Off button.

–  Open shut-off taps „A“ and „B“ of pressure tester -VAS 6551- and close shut-off tap „C“. –  Connect Vehicle diagnosis tester and then carry out „Guided Fault Finding, Checking electrical fuel pump(s)“.   Note The fuel pump is now activated for 30 seconds. –  Carefully close shut-off tap „B“ and set pressure of 4.5 ± 0.1 bar. –  After setting desired pressure, empty measurement container and carry out „Guided Fault Finding, Checking electrical fuel pump(s)“ again. –  Observe pressure on pressure tester -VAS 6551-. –  After controlling pump (30 seconds), read supplied fuel quantity in measurement container. Specification: min. 1,400 ml If the specifications are attained: fuel system pressurisation pump -G6- OK, check whether the fuel hoses which lead to the engine are kinked or squashed and replace if necessary.