Checking fuel pump capacity (B235R)
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Checking fuel pump capacity (B235R)
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Warning
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This check involves partial dismantling of the car's fuel system. The following points must be observed in connection with the work:
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Work only in a well-ventilated area! If approved equipment for the extraction of fuel vapours is available, be sure to use it.
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Wear suitable gloves! Prolonged contact with fuel can cause skin irritation or dermatitis.
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Keep a class BE fire extinguisher close at hand! Beware of sparks caused by short circuits and when connecting and disconnecting leads in electrical circuits.
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No smoking anywhere in the vicinity.
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1.
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Remove the engine cover.
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2.
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Remove the fuel pump fuse no. 32 while the engine is running. Turn off the ignition once the engine has stopped.
Refit the fuel pump fuse no. 32.
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3.
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Detach the return line from the fuel rail. Use special tool no. 83 95 261. Remove the rubber seal from the quick-release coupling with a pair of flat-nose pliers.
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Important
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It is essential that great care is taken not to damage the sealing surface on the male part of the fuel line quick-release coupling when it is disconnected. If the male part is excessively dirty, it should be cleaned before being released. In addition, clean the sealing surface after releasing it if necessary. Use a soft rag. Lubricate the male part before fitting.
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4.
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Connect the adapter and hose, special tool no. 83 94 918, to the return side of the fuel rail. Run the hose to a receptacle.
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5.
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Connect the diagnostic tool and run the fuel pump for 30 seconds.
While being run for 30 seconds, the pump should deliver at least 700 ml fuel to the receptacle.
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6.
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Disconnect the adapter with hose from the fuel rail return.
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7.
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Connect the return line to the fuel rail, lubricating the male part with acid-free vaseline, part no. 30 06 665, before connecting it.
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