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General E46 Forum
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Old 12-10-2011, 06:00 PM   #1
findmadhav
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Fuel Pressure regulator help

Hi everyone,

2 days back the SES light came on and I got 3 codes - P1250, P1188, P1189. I searched a lot in this forum and other forums too and came to the conclusion that I need to change my fuel filter and fuel pressure regulator.
I did change my filter. However, I did not find the pressure regulator location. Can someone please post a pic/video showing the exact location. My car is a 2000 323i and I know it is under the hood.

PLEASE DONT SHOW ME THE REALOEM diagram because that does not help me.

Thanks.
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Old 12-10-2011, 06:33 PM   #2
mik325tds
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Hi,
The M52TU has two possible locations for the fuel pressure regulator. One is on top of the engine, directly connected to the fuel rail and the other one is near the fuel filter right next to the 3/2way valve. You should have seen it when you replaced the filter. Round in shape with a vacuum line connected.
PM me if you need pics.

What are the symptoms?

Michael
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Old 12-10-2011, 06:43 PM   #3
findmadhav
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No symptoms. The ses light came on with p1250 code 2 days back and the went away yest. Do I need to change the fuel pressure regulator at all? Car running fine now. Pls let me know.

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Old 12-10-2011, 06:45 PM   #4
mack89
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I say it's not worth it. I had 0170 0173 1188 1189 for a long time, replaced fuel pump/filter/pressure regulator which did nothing to eliminate those codes.
Spend your money on getting proper diagnosis, take smoke test and check O2 sensors. Vacuum leak & O2 malfunction is your prime suspect of LEAN codes
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Last edited by mack89; 12-10-2011 at 06:49 PM.
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Old 12-10-2011, 06:46 PM   #5
findmadhav
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You mean vacuum hoses?

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Old 12-10-2011, 06:50 PM   #6
mack89
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^Shoot, sry I meant vacuum leak. Mostly caused by cracked intake boots and many other gaskets in intake system.
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Old 12-10-2011, 06:52 PM   #7
findmadhav
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Thanks a lot will return the regulator now n save 60 bucks. Spent enough on lcab n fuel filter this weekend. Gonna change spark plugs next.

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Old 12-10-2011, 06:58 PM   #8
mack89
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^Changing spark plugs will definitely help your car running better, but I strongly suggest you to spend money on proper diagnosis first. Smoke test and O2 sensor diag...
Not saying you're doing it in wrong way, just speaking from my experience that random R&R wouldn't work. TRust me
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Old 12-10-2011, 06:59 PM   #9
findmadhav
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Ok will do. Cheapest n best place to do this?

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Old 12-10-2011, 11:13 PM   #10
mack89
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Well any place with smoke test machine will do. Price may vary, my shop quoted me $40 for smoke test only.
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Old 12-11-2011, 12:01 AM   #11
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Quote:
Originally Posted by mik325tds View Post
Hi,
The M52TU has two possible locations for the fuel pressure regulator. One is on top of the engine, directly connected to the fuel rail and the other one is near the fuel filter right next to the 3/2way valve. You should have seen it when you replaced the filter. Round in shape with a vacuum line connected.
PM me if you need pics.

What are the symptoms?

Michael
I thought the fuel pressure regulator was next to the fuel filter (part of 2/3 valve) under the drivers side or incorporated into the fuel filter on newer e46 versions. Both under the car.
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Old 12-11-2011, 09:47 AM   #12
findmadhav
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SES came on again. Codes p301 302 303 cyl misfire. Also p0175 - fuel trim. My 323i has fuel pressure regulator under the hood. Pls post pics. Gonna change tat n the spark plugs.

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Old 12-11-2011, 10:03 AM   #13
findmadhav
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Quote:
Originally Posted by mik325tds View Post
Hi,
The M52TU has two possible locations for the fuel pressure regulator. One is on top of the engine, directly connected to the fuel rail and the other one is near the fuel filter right next to the 3/2way valve. You should have seen it when you replaced the filter. Round in shape with a vacuum line connected.
PM me if you need pics.

What are the symptoms?

Michael
Pls send me pics of fuel pressure regulator.

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Old 12-11-2011, 10:04 AM   #14
Pinzon89
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I bet neither will fix it. More than likely you just have a vacuum leak that you haven't diagnosed. You need to take it to a shop and save money by not throwing parts at it.
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Old 12-11-2011, 03:21 PM   #15
findmadhav
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I am taking it to the shop tomorrow. The codes that I got today are:
P1188, P1189, P0175, P0301, P0302, P0303.
I just hope it is due to some vacuum hose being bad.
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Old 12-11-2011, 08:36 PM   #16
flashmeow
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Quote:
Originally Posted by mik325tds View Post
Hi,
The M52TU has two possible locations for the fuel pressure regulator. One is on top of the engine, directly connected to the fuel rail and the other one is near the fuel filter right next to the 3/2way valve. You should have seen it when you replaced the filter. Round in shape with a vacuum line connected.
PM me if you need pics.

What are the symptoms?

Michael
+1

for the M52TU engine the fuel pressure regulator is next to the fuel filter and is part of the 3/2 valve. it is a circular thing a size of a half dollar coin
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Old 12-11-2011, 09:44 PM   #17
findmadhav
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Quote:
Originally Posted by flashtwosix View Post
+1

for the M52TU engine the fuel pressure regulator is next to the fuel filter and is part of the 3/2 valve. it is a circular thing a size of a half dollar coin
That is for the newer BMWs, Mine is under the hood, next to the fuel injectors, but cant find where. Thats why I wanted pics.
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Old 12-11-2011, 10:04 PM   #18
mack89
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Nah it's located right by the fuel filter. I've replaced it myself, I know it's part of the 3/2 valve.

#3
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Old 12-12-2011, 02:15 AM   #19
BMWCaptain
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Quote:
Originally Posted by findmadhav View Post
That is for the newer BMWs, Mine is under the hood, next to the fuel injectors, but cant find where. Thats why I wanted pics.
Your car is just like ours a 2000 323i has the fuel pressure regulator under the car by the fuel filter!

On the newer e46 it is built into the fuel filter.

This is the only locations on an E46.

Do you have a different BMW?
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Old 02-04-2013, 01:46 AM   #20
iDonic7
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Hello )

Soo.. I've been having car starting trouble. Please if you could tell me.

Is it my Fuel Pressure Regulator? I know that filter of this regulator can be replaced itself, or do I replace the filter and the electrical part with the ports running out also? *Picture added*

Symptom: Car wouldn't start, No prime at fuel pump. Detached hose next to fuel pump, 30 seconds then re connected fuel pump hose. Car started and died 10 minutes later. Repeat process no luck.

Disconnected Fuel Filter and allowed a decent amount of fuel to leak out from the filter and from the line leading into the Fuel Pressure Regulator. Reconnected and car started Car suddenly doesn't start every now and then :/ I don't like it.

Replaced: Fuel Filter, Fuel Pump, Fuses all checked and good. Relay is good. Power at pump is good. Fuel pressure at the rails with car running 50psi exactly.

Thanks for your time!
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