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General E46 Forum
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Old 05-13-2009, 09:18 PM   #1
240sxplan
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Fuel Pressure Regulator?

Hi, guys..

I want to ask if anyone here on the forum has after market FPR.. so they can adjust the fuel pressure.. I'm thinking that at 130k... time to change it. also fpr is giving me some codes... so will this be good idea or bad... stock cost $90 bucks shpped.. after market $40 shipped.. let me know eh...

giving fuel more pressure would allow for more hp.. this fact holds true with all the cars i work with in the past.

please answer if you try it before.

thanks you,

tsua
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Old 05-14-2009, 09:49 AM   #2
BWMguy206
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What kind of codes are you getting? Factory FPRs rarely fail. Have you ever replaced the fuel filter? Increasing fuel pressure will NOT give you more power but will give you more problems.
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Old 05-15-2009, 12:19 AM   #3
240sxplan
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I'm getting the codes 1248, 1250, 1188 , 1189..
130k miles.. need to find the problem.. some people replace o2 sensors, fuel filter, and fpr.

so what happens when you increase pressure on a bmw?
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Old 05-15-2009, 12:31 AM   #4
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Fuel pressure regulator on the E46 is built into the fuel filter so it gets changed every time you change the fuel filter. The scheduled service interval for a fuel filter is ever 60,000 miles so you should have installed a new fuel pressure regulator 10,000 miles ago.
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Old 05-15-2009, 12:36 AM   #5
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Originally Posted by 240sxplan View Post
I'm getting the codes 1248, 1250, 1188 , 1189..
130k miles.. need to find the problem.. some people replace o2 sensors, fuel filter, and fpr.

so what happens when you increase pressure on a bmw?
-If you increase the pressure a small amount, the car will automatically trim the fuel amount so that it gets the correct air fuel ratio, so essentially nothing will happen.
-If you increase the fuel pressure a little more, the fuel injection sequences will be less accurate since the fuel is injected over a shorter period of time so the opening and closing time of the fuel injectors becomes a larger and larger part of the equation.
-If you increase the fuel pressure a lot, your car will be unable to compensate because the actual fuel pressure will be so far off the preset values programmed into the ECU and your car will run like crap and you might even ruin your catalytic converters.

I kinda want to get a nice Aeromotive fuel pressure regulator just for the looks, but the cost of the fuel pressure regulator is $100+, you also need various fittings and adapters $30+, then you would have to ditch the OEM fuel filter and regulator, and get an aftermarket fuel filter setup $40+, and while you are at it, probably getting new fuel lines $90+, and a new fuel rail, $30+. So like $300+ just for a modified fuel filter and regulator setup, which I can't really justify at all.
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Old 05-15-2009, 03:02 AM   #6
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Fuel filter changed today (53,000 miles/85,000kms). Not bad really but was restricting fuel flow. Plugs done too.
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Old 05-15-2009, 03:05 AM   #7
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Fuel filter changed today (53,000 miles/85,000kms). Not bad really but was restricting fuel flow. Plugs done too.
Try cutting open the fuel filter. You can see all the crud and things they filter out. People have done it and the amount of stuff filtered from gas is surprising.
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Old 05-15-2009, 08:14 AM   #8
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Originally Posted by mkodama View Post
Fuel pressure regulator on the E46 is built into the fuel filter so it gets changed every time you change the fuel filter. The scheduled service interval for a fuel filter is ever 60,000 miles so you should have installed a new fuel pressure regulator 10,000 miles ago.
That only applies to the newer cars. E46 328i has a separate FPR under the hood not attached to the Fuel Filter.
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Old 05-15-2009, 08:39 AM   #9
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That only applies to the newer cars. E46 328i has a separate FPR under the hood not attached to the Fuel Filter.
I want your e9X wheels!!!!!!

OEM FTW!
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Old 05-15-2009, 04:44 PM   #10
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That only applies to the newer cars. E46 328i has a separate FPR under the hood not attached to the Fuel Filter.
Hmm, I did not know that. I just looked it up and the M52 engine has some weird setup with a 3/2 valve whatever that means.

What any of this stuff does I do not care to know, since it is probably pointlessly complex for no reason in typical 80's-90's German fashion:
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Old 05-15-2009, 06:42 PM   #11
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THANK YOU , GUYS.. this does help me out a lot.. I'm not going to spend.. $300+ n still not get any performance from it.

I'm working on a 1999 328i.. Recent up grade h&r suspension, M3 trailing arm bushing, clear lights, cold air intake homemade, new tires, newer ac Compressor, New door lock, new front seats, rear lip, mud flaps, replace intake tubes, replace termostat.

i'm getting some codes saying that I need o2 sensors, fpr, and fuel filter.

Thank you for the heads up about more fuel pressure.. Looks to be fuel filter and fpr stock.. next week.

again thanks..

tsua
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Old 06-03-2009, 07:08 PM   #12
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Does fuel filter give off a code? I heard that it doesnt.
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Old 06-03-2009, 08:05 PM   #13
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Does fuel filter give off a code? I heard that it doesnt.
It does not. It's good to just replace it every 30,000 to 60,000 miles.
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Old 03-17-2011, 05:21 PM   #14
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sorry to dig this thread outta its grave, but where exactly is the fpr located under the hood. i was planning on changing mine and was wondering how far i have to dig.

thanks
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Old 05-01-2012, 08:33 PM   #15
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sorry to dig this thread outta its grave, but where exactly is the fpr located under the hood. i was planning on changing mine and was wondering how far i have to dig.

thanks
krzyc, as described above, you need to determine whether your fuel pressure regulator is built into your fuel filter or not. Hint: I just went to ECS and read it in the description, seemed faster than realoem.

If it's built into your FF, you can look under the hood all day...or just check under the driver side door.

I'll be inspecting my fuel delivery system tomorrow thanks to P0172 P0175 rich codes.
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Old 05-01-2012, 10:43 PM   #16
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sorry to dig this thread outta its grave, but where exactly is the fpr located under the hood. i was planning on changing mine and was wondering how far i have to dig.

thanks
If its for the 2000 323, its not under the hood and not built into the fuel filter. It's about another foot towards the front of the car from the fuel filter. Very easy to replace. I think the hardest part is sliding the mounting pin back in correctly.
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Old 08-22-2012, 12:09 AM   #17
01drop3naquarter
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Regulator question

My car runs rough so i changed the filter/regulator..
i had the car running and there was no vacum at
the regulator .. is this normal ???
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Old 08-22-2012, 12:58 AM   #18
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Originally Posted by 240sxplan View Post
THANK YOU , GUYS.. this does help me out a lot.. I'm not going to spend.. $300+ n still not get any performance from it.

I'm working on a 1999 328i.. Recent up grade h&r suspension, M3 trailing arm bushing, clear lights, cold air intake homemade, new tires, newer ac Compressor, New door lock, new front seats, rear lip, mud flaps, replace intake tubes, replace termostat.
tsua
mud flaps?! Seriously?

BTW, those codes may not be telling you that you need new O2 sensors, they may be telling you that you have a vacuum leak. It could be related to the home made CAI, or any number of other vacuum leaks.
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Old 09-05-2012, 12:12 PM   #19
Harley325i
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My 325i has no fuel in fuel rail I turn the key on and there is a humming noise uder the intake manafold is tht the problem
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Old 09-05-2012, 03:18 PM   #20
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My 325i has no fuel in fuel rail I turn the key on and there is a humming noise uder the intake manafold is tht the problem
Is your fuel pump working? It does not sound like it is. I don't think the humming noise is related. Remove the bottom of your back seat, and you can hear if the fuel pump is kicking in when you turn the key. Of course, that does not mean it is generating enough pressure.
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