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| Remove the supply line -1- from the fuel filter. Push the buttons on the fuel hose coupling for this purpose. |
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| Connect the pressure gauge -VAG 1318- to the fuel filter with the help of the adaptor -VAG 1318/17-. |
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| Connect adapter -VAG 1318/1- to adapter -VAG 1318/11- of pressure tester -VAG 1318- and insert in a measuring container. |
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| Close cut-off tap of the pressure gauge -VAG 1318- (lever at right angle to direction of flow-B-). |
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| Press the remote control for approx. 10 seconds in order to fill the fuel filter and to build up the system operating pressure. |
| The 3 bar pressure regulator must generate an approx. pressure of 3 bar in the system. |
| The 4 bar pressure regulator must generate an approx. pressure of 4 bar in the system. |
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 pressure gauge -VAG 1318-. After 10 minutes the pressure may only fall by max. 0.5 bar |
| If the pressure drops further: |
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| Check that there are no leaks in the pipe connections. |
| If no leaks are observed in the pipes: |
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| Fuel pump is defective, renew fuel delivery unit → Chapter. |
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