5 Series E34 540i (M60-2) TOUR
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If the measured value does not increase:
Replace vacuum hose and measure fuel pressure again
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If the measured value still does not increase:
Replace pressure regulator
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Measure fuel pressure again and note down measured value.
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Compare the measured value with the nominal value stamped in the pressure regulator housing.
If the specified measured value is still not achieved, you must carry out the following checks depending on the
measured value.
If the measured value is less than the nominal value - 0.2 bar:
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The cross-sections in the fuel feed line are contracted or the fuel filter is clogged,
or
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the fuel pump voltage supply is not O.K., e.g. due to high contact resistance (corrosion) in the plug
connection between wiring harness and fuel pump
If the measured value is greater than the nominal value + 0.2 bar:
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Switch off engine and then observe measured value.
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If the measured value drops to the nominal value, the cross-sections in the fuel return line are contracted
or clogged.
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Check the fuel lines for kinks.
If no kinks are visible:
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Replace return lines.
If the measured value remains too high, the pressure regulator is most probably faulty.
Caution!
With less likelihood, the return line may be completely blocked. When the pressure regulator is removed, fuel could
escape under pressure!
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As a precaution, have a cleaning cloth ready and collect and dispose of any escaping fuel.
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Replace the return line but not the pressure regulator.
Complaint: starting problems
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Run engine briefly at idle speed and switch off.
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Note measuring value when engine is stationary.
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Read off measured value again after approx. 20 to 30 minutes with engine stopped.
The special tool 13 3 010 (hose clip) is needed for the following check.
If the measured value has dropped by more than 0.5 bar:
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Start engine and wait briefly for a stable pressure increase.
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Switch off the engine and immediately pinch off the delivery line just before the pressure gauge with the
special tool 13 3 010.
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Note down measured value.
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Read off measured value again after approx. 20 to 30 minutes with engine stopped.
RA Notes on fuel pressure check (reference pressure: intake manifold pressure)
BMW AG - TIS
28.01.2013 03:20
Issue status (12/2007) Valid only until next DVD is issued
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