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Old 02-20-2013, 03:58 PM   #4
e46crooser
Registered User
 
Join Date: Jul 2009
Location: Brentwood, CA
Posts: 63
My Ride: 99 328 5spd
50 psi (3.5 bar) is spec fuel pressure on 325.
-the drop you are encountering is normal
If your vehicle is running rich then you need to consider the following:
-Is the car reaching operating temperature quickly? (running cold will yield rich fuel mixture)

The FP regulator is built into the fuel filter anyhow, so if you are worried about a bad fp regulator then replace the fuel filter. Make sure it's OE or Mahle.
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