| Checking fuel pump non-return valve |
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| Remote control -V.A.G 1348/3A-, connected |
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| Pressure measurement device -V.A.G 1318-, connected |
Note! | With this check the fuel supply pipe connections from the fuel delivery unit to the point at which the pressure gauge -V.A.G 1318- is connected will be checked for leaks at the same time. |
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| Close pressure gauge shut-off tap (lever at right angles to throughflow direction - position -B-). |
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| Operate remote control at short intervals, until a pressure of 3 bar has built up. |
Caution | Danger of spray when opening the shut-off tap, hold container over the pressure gauge free connection. |
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| Release the excess pressure by carefully opening the shut-off valve. |
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| Watch pressure drop on gauge. After 10 minutes the pressure must not drop below 2.5 bar. |
| If the pressure drops further: |
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| Check pipe connections for leaks. |
| If no wiring fault is detected: |
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| Fuel pump defective, renew fuel delivery unit → Chapter. |
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