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Update:
Got a new fuel pressure test gauge. The new gauge is reading 49psi at idle. Still a little high per Bentley. Other sources I see online seem to think 49-50 psi is fine at idle.
With the new gauge, I did some more tests with the gauge attached to the fuel rail:
- Per @80stech, with the gauge secured on the windshield, I drove the car. The fuel pressure remained pretty constant at 49psi unless I blipped the throttle, which would cause the fuel pressure to drop a little bit temporarily.
- I removed the fuel pressure regulator "vacuum" line from the intake boot. The fuel pressure did NOT increase. Per Bentley, the fuel pressure is supposed to increase by 6-10 psi when doing this. It's not entirely clear but it seems as though Bentley wants you to remove the vacuum line AT the fuel filter. I removed the line at the intake boot, which I would think would produce the same result. Bentley says to replace the fuel filter/regulator if the pressure does not increase.
I have a fuel filter/regulator on order.
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2005 X5 3.0 6-spd.
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10-31-2023, 05:51 PM
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