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| Screw the adapter -VAG 1318/23- and the adapter -V.A.G 1318/17-1- on to the pressure tester -VAG 1318-. |
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| Fit the adapter -V.A.G 1318/17-1- to the disconnected fuel supply line. |
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| Screw the adapter -V.A.G 1318/11- on to the pressure tester -VAG 1318-. Connect the auxiliary hose -arrow- and insert the other end in a measurement container. |
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| Close cut-off tap of pressure tester -V.A.G 1318- (lever at right angles to direction of flow -B-). |
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| Operate the remote control for short periods until an overpressure of approx. 4.8 bar has been reached. |
WARNING Danger of spray when opening the shut-off tap, hold container over the pressure gauge free connection. |
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| If pressure builds up too high, lower excess pressure by carefully opening the shut-off tap. |
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| Observe pressure drop on tester. After 10 minutes the pressure must not drop below 4 bar. |
If the pressure drops further: |
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| Check the connections, O-rings and injectors for leaks. |
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| Test pressure gauge for leaks. |
If no fault is found in wiring: |
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| Fuel pump retention valve is faulty, replace the fuel supply unit → Chapter . |
Continue the installation in the reverse order of removal sequence, observing the following: |
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