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M54 Fuel Pressure: How long should the system hold pressure? According to my Bentley, system pressure is 3 5 bar (+ - 0 2) 20 minutes after shutting off the engine, fuel pressure should not have dropped more than 0 5 bar from the measured system pressure
How do I tet fuel pressure on 540i m62 V8? - BimmerFest BMW Forum You need a gauge that you can Tee into the fuel line Are you having problems? If so and you have never changed your fuel filter I'd change it Your fuel pressure at idle should be about 52 PSI Leave the gauge connected and turn the engine off The pressure shouldn't drop more than 7 PSI in ~20min
how to test fuel pressure properly? - bimmerforums. com Pressure should be 3 5 bar + - 0 2 bar with engine off and fuel pump activated manually from the relay socket in the trunk If no vacuum is applied to the pressure regulator it should simulate full throttle condition and therefore maximum regulated pressure
Question on Fuel Pressure Test Diagnostic - BimmerFest BMW Forum The spec for holding fuel pressure is after 20 min the pressure shouldn't drop more that 7 PSI (from 50+) Change your fuel filter, if the pressure doesn't return to normal your pump in probably shot
proper way to test fuel pressure? - BMW M5 Forum and M6 Forums There is a vacuum hose that comes in to the pressure regulator With engine idling and vacuum hose connected, pressure should be 62 psi With vacuum hose disconnected, pressure should be 72 psi (If you get no vacuum at the hose, the connection to the engine vacuum at #7 ITB has rotted out )
BMW Workshop Service and Repair Manuals gt; 5 Series E34 540i (M60-2 . . . - Measure fuel pressure again and note down measured value - 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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