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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 02-28-2012, 08:35 AM   #1
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Join Date: Apr 2010
Location: CT
Posts: 20
My Ride: E46, E92
Anyone with a Bentley? FPR testing needed

Wondering if someone with a Bentley could help me out. Looking for fuel pressure specs on a 2003 325xi (M54) with FPR integrated into the fuel filter.

I got ~50 psi steady no matter if the engine was running or not. This made me think the FPR vac reference fell off... but upon further research it appears that the vacuum line runs to the intake boot -- not the intake manifold.

If you could scan the page or take a pic with fuel pressure testing, it would be VERY much appreciated!

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Old 02-28-2012, 10:07 AM   #2
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Join Date: Aug 2011
Location: Knoxville, TN
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My Ride: 2004 325i
For the MS 43.0 fuel filter, with built-in regulator, PSI specs are 50.76 +/-2.9 psi.
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Old 02-29-2012, 01:05 PM   #3
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Originally Posted by DerRoteBaron View Post
For the MS 43.0 fuel filter, with built-in regulator, PSI specs are 50.76 +/-2.9 psi.
Awesome, thanks for getting this info for me!

So it seems as though the E46 FPR doesn't work as I thought? Usually its plumbed to the intake mani and adjust fuel pressure according to vacuum. Now I believe it is a constant pressure (although i'm not sure what purpose the vacuum line serves).Can anyone confirm?

Last edited by a32guy; 02-29-2012 at 01:07 PM.
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