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| Connect pressure tester -VAS 6550- to fuel supply line with adapter -VAS 6550/1-. Hold adapter -VAS 6550/2- in a measuring container. |
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| Close pressure gauge -VAS 6550- shut-off tap -A- (lever at right angles to direction of flow). |
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| Operate remote control at short intervals until a pressure of approx. 4 bar has built up. |
WARNING Danger of spray when shut-off tap is opened. Wear eye protection and protective clothing to avoid injuries and skin contact. Hold container before free connection of pressure tester. |
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| If pressure builds up too high, relieve excess pressure by carefully opening shut-off tap. |
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| Watch pressure drop on pressure gauge. After 10 minutes, pressure must not drop below 3 bar. |
If the pressure drops further: |
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| Check line connections for leaks. |
If no fault in lines is detected: |
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| Fuel pump non-return valve is defective, renew fuel delivery unit → Chapter. |
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