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Old 09-18-2013, 06:00 AM   #1
Inspite
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Fuel pump advice - M3

Hey e46ers

I know this is well documented but wanted an aussie perspective.

Out of the blue my M3 wouldn't start and after some serious googling I've come to believe my fuel pump has died.

The day before it started oddly like it wasnt getting any fuel and now it cranks perfectly fine but no juice.

I can't hear it at all when I switch the ignition on so its either the relay or the pump.

Have any of you guys replaced it and if you did where did you get one from (OEM or aftermarket)

There are whole bunch on eBay for different applications and I can only find an OEM with the whole cradle etc for around $350 which is over priced.

In previous cars I've upgraded to walbro pumps but not sure if thats the right path with the M3.

Cheers in advance for any help/advice
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Old 09-18-2013, 07:03 AM   #2
fgin
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I wasted a lot of money on a new fuel pump for similar symptoms and found it was the crank shaft sensor. My advice is to get the car hooked up to a diagnostics machine and get the codes read. It might not tell you the fuel pump is shot without a pressure test but it will most likely tell you if its a sensor like my experience. Don't change things until you find out
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Old 09-18-2013, 07:10 AM   #3
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i had same symptoms. it was the fuel pump. happened suddenly too.
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Old 09-18-2013, 08:21 AM   #4
jamesbice
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Fuel pump advice - M3

Mine had an intermittent cut during normal driving, then one day just have up - the dealer slugged me 900 for a new one too!


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Old 09-18-2013, 03:23 PM   #5
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Buy OEM. I have a brand new one in the box never been used $450 inc postage
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Old 09-18-2013, 04:34 PM   #6
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Originally Posted by 02PRUV View Post
Buy OEM. I have a brand new one in the box never been used $450 inc postage
bargain
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Old 09-18-2013, 09:26 PM   #7
Inspite
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At this stage I'm probably getting a 255l Walbro pump for around $110 delivered and install it myself.

I only need the actual pump and buying the whole unit is just a waste personally.
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Old 09-19-2013, 01:05 AM   #8
02PRUV
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Quote:
Originally Posted by Inspite View Post
At this stage I'm probably getting a 255l Walbro pump for around $110 delivered and install it myself.

I only need the actual pump and buying the whole unit is just a waste personally.
You will have issues. M3's run 5 bar base fuel pressure not 3 bar. You will not get the right flow rate out of a walbro. Also the pump is voltage controlled from the ECU to adjust pressure and again this will increase the flow rate issues with a pump that just won't keep up at the 14.5v let alone less volts.

But hey you can always choose to ignore me. What would I know.
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Old 09-19-2013, 06:50 PM   #9
Inspite
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If the Walbro is not the way to go how come HPF use them in one of their uprated fuel pump kits?

http://www.horsepowerfreaks.com/part..._In_Tank/16889

From my understanding that's a 255L Walbro?
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Old 09-20-2013, 03:02 AM   #10
02PRUV
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Quote:
Originally Posted by Inspite View Post
If the Walbro is not the way to go how come HPF use them in one of their uprated fuel pump kits?

http://www.horsepowerfreaks.com/part..._In_Tank/16889

From my understanding that's a 255L Walbro?
Sorry I wasn't aware you had bigger injectors, aftermarket fuel pressure reg., aftermarket ECU so you can set your fuel pressure for your base fuel pressure for bigger injectors and tune your ecu for what ever fueling you want. If that's the case go get your Walbro. Hey if it comes down to that get two. I run twin intank Walbros .
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Last edited by 02PRUV; 09-20-2013 at 03:03 AM.
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Old 09-20-2013, 05:02 AM   #11
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Quote:
Originally Posted by 02PRUV View Post
Also the pump is voltage controlled from the ECU to adjust pressure and again this will increase the flow rate issues with a pump that just won't keep up at the 14.5v let alone less volts.
The E46 M3 DOES NOT control the voltage to the fuel pump by the ECU. It is a straight relay to the pump at standard voltage.

Done two complete wiring implementations on M3 race cars. This is a myth.

Cheers

Brian
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Old 09-20-2013, 05:09 AM   #12
ating
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Quote:
Originally Posted by 02PRUV View Post
Sorry I wasn't aware you had bigger injectors, aftermarket fuel pressure reg., aftermarket ECU so you can set your fuel pressure for your base fuel pressure for bigger injectors and tune your ecu for what ever fueling you want. If that's the case go get your Walbro. Hey if it comes down to that get two. I run twin intank Walbros .
No need to be so condescending. The guy was just asking a question.
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Old 09-20-2013, 08:41 AM   #13
Inspite
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What he meant to say was

Quote:
Originally Posted by 02PRUV View Post
From previous experience I would recommend going with an OEM solution as you may find difficulties getting the right amount of pressure with stock injectors
But what would I know

Anyway I bought a OEM pump from the US for $408

Local dealer would supply one for $785 and I told him I only wanted one but he didn't get the joke
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Old 09-20-2013, 09:05 AM   #14
02PRUV
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Quote:
Originally Posted by Aussie M3Ti View Post
The E46 M3 DOES NOT control the voltage to the fuel pump by the ECU. It is a straight relay to the pump at standard voltage.

Done two complete wiring implementations on M3 race cars. This is a myth.

Cheers

Brian
You completed wiring on E36 M3 race cars?

I like how no one likes to listen to me. But like I said what would I know.

The Fuel Pump supplies fuel when it receives operating voltage from the Fuel Pump Module. The ECM Relay supplies voltage to theFuel Pump Module (M3 -located in the trunk, above right wheel well). The ECM controls the activation of the fuel pump module. After the
ignition is switched ON, the ECM provides voltage for the fuel pump
module and the voltage is maintained (pulse width modulated) with the presence of the engine speed signal. A high output fuel pump is utilized to match the fuel supply demands of the S54 engine (5Bar). The ECM will cycle the voltage signal (0 - 120 Hz) to the fuel pump module. The fuel pump module will cycle the voltage to the pump (to reduce the speed). The fuel pump will operate at low speed during idle and part load. The pump will run at full speed during startup (approx. 20 seconds) and full load. The power to the fuel pump module will be switched off in the event of an airbag activation.
The MRS III control module will signal the ECM over K-bus and CAN bus for this purpose.
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Ford Escort Mk2 2JZGTE 600rwhp @14 psi
04 Yamaha R1 154.3rwhp
ISUZU FZR550 tilt tray (GT35 Turbo)
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Old 09-20-2013, 09:10 AM   #15
02PRUV
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Originally Posted by ating View Post
No need to be so condescending. The guy was just asking a question.
Sorry for being condescending. I thought my first explaination covered everything and I thought comparing a stock M3 to a modified turbo M3 was just ridiculous.
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VY SS Ute Turbo 1004.6rwhp @ 28psi E85
Ford Escort Mk2 2JZGTE 600rwhp @14 psi
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Old 09-24-2013, 11:05 PM   #16
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So is the outcome of this that any replacement fuel pump should closely match the flow rates of the OEM pumps?
As the system runs at 5 Bar BMW have chosen to save electrical power and the pump some work etc. by reducing the flow at low fuel consumption times. Nice.
I doubt the OEM pump fails to maintain pressure at WOT etc. So increasing the flow really gains very little if anything and may be at the cost of using more energy to drive the pump. Small though this extra power may seem it may impact the pump speed control electronics. I would check the current draw of any aftermarket pump at 5 Bar and similar flow rates to the OEM item.
Just a thought. Still worth pursuing as the OEM items are over priced.
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