Checking the fuel pressure regulator (B235R, B205L/R)
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Checking the fuel pressure regulator (B235R, B205L/R)
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Warning
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This check involves partial dismantling of the car's fuel system. The following points must therefore 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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Reduce the fuel pressure by removing the fuel pump fuse no. 32 while the engine is idling. Turn off the ignition once the engine has stopped.
Fit the fuel pump fuse no. 32.
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2.
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Remove the engine cover.
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5.
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Start the fuel pump with the diagnostic tool.
It may be necessary to restart the pump during the check as the activation period using the diagnostic tool is 30 s.
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6.
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Check the reading at atmospheric pressure. It should be 3 bar (43 psi).
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7.
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Increase the vacuum in the pressure regulator with the pressure/vacuum pump. The system pressure should drop with the same amount as shown on the pressure gauge.
System pressure: 3.0 bar (43 psi)
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8.
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Pump up pressure in the fuel pressure regulator with the vacuum pump. The system pressure should now increase with the same amount as shown on the pressure gauge.
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9.
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“Safety on“ the adapter and remove the pressure gauge equipment from the fuel rail service nipple. Screw on the valve cap.
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10.
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Remove the pressure/vacuum pump from the fuel pressure regulator and connect the vacuum hose.
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11.
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Fit the engine cover.
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