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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Apr-14-2018, 09:12:10 PM   #1
icanseeyou
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Default PSA - Change your fuel filters!

Just experienced the most rewarding "troubleshooting" i ever had.


Last week i experienced loss of throttle, when ever i press on the gas, the rpms would drop and the car would stall. Went ahead and decided it was the fuel pump, plus it was about time for it to fail (105k Miles). Ordered a Walboro 255lph, went ahead with a whole new kit, Radium sleeve to make it fit nicely, new hose from pump to housing, the whole nine yards - Car didn't hold fuel pressure. I could remove the hose from the fuel pump to the fuel supply with absolutely no need to relieve the fuel pressure, there was no spills or anything.

Okay, i thought - maybe i messed something up on the fuel pump. Ordered a new fuel sock, went with a rubber hose from pump to housing - absolutely no chance the pump doesn't hold pressure now - The check valve is in good shape when bench tested too so i know the pump is not faulty out of the box.


Start the car up, idles for 5 seconds, stalls out. Try to start again, check engine light - Great, lets scan it!
P0300 P0301 P0302.
That's it. No lean codes, no rich codes, just bank 1 misfires. Okay, must be the Euro headers, maybe i swapped the O2 sensors by accident when i installed them 2 months ago, or maybe the O2 sensor is dying. Decide to put that as last resort, not willing to grab new sensors just yet.

Clear the codes.

Pull the pump again, look over everything, top off with 5 gallons of gas, start it up, runs for good 30 seconds, stalls out again, and doesn't even start now - check engine! Let's scan that now -
P0305 P0306 P1745.

Different Bank, only 2 cylinders misfiring, but i got a different code, finally related to fuel system. Awesome, must be something with air supply because its' saying it's running too rich.

Smoke test it - nothing leaking that shouldn't be leaking.

Okay, must be my MAF - Go to a store, pay 140 bucks, buy a new one - Install it, still doesn't run, starts up for 2 seconds and dies.

Okay, must be my fuel supply, go back to the same store, rent out a fuel pressure gauge, hook it up - 13 PSI. a little less than 60 PSI below spec.

I had a fuel filter ordered months ago, just never got to replacing it, so i figured that will be one of the steps to get it through trouble shooting.

Spend a good 30 minutes in windy Saturday Chicago weather, pull the filter out. Put new and old one side by side and decide to blow into the supply hole - I literally cannot blow through it. Hmm, weird. Let's try the new one - Blow straight through.

THE FUEL FILTER WAS SO CLOGGED I COULDN'T EVEN START THE DAMN CAR. WHEN A LITTLE BIT MORE POWERFUL PUMP WAS INSTALLED, IT CLOGGED IT COMPLETELY.

GUYS, I AM JUMPING IN JOY RIGHT NOW, SUCH A DAMN SIMPLE FIX, FOR SUCH A DAMN CONFUSING PROBLEM.

Thanks for the read.
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Old Sat, Apr-14-2018, 10:25:39 PM   #2
Joshe46
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Default Re: PSA - Change your fuel filters!

Glad it turned out to be so simple. But ugh tell me about this chicago weather! Miserable wind. The M still isnít out of storage
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Old Sat, Apr-14-2018, 11:06:04 PM   #3
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Default Re: PSA - Change your fuel filters!

Yeah but the Cubbies came back and whooped Atlanta's ass today!

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Old Sun, Apr-15-2018, 12:22:37 AM   #4
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Default Re: PSA - Change your fuel filters!

Quote:
Originally Posted by Joshe46 View Post
Glad it turned out to be so simple. But ugh tell me about this chicago weather! Miserable wind. The M still isnít out of storage
God, tell me about it. Thursday was perfect, but the M wasn't running so i was swearing most of the afternoon that i couldn't go for a drive..

Thank god i finished right before the rain started!
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Old Sun, Apr-15-2018, 12:26:56 AM   #5
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Default Re: PSA - Change your fuel filters!

Quote:
Originally Posted by icanseeyou View Post
God, tell me about it. Thursday was perfect, but the M wasn't running so i was swearing most of the afternoon that i couldn't go for a drive..



Thank god i finished right before the rain started!


Thursday was unreal. Knowing the weather was gonna turn Sh*t again I just decided to leave the M in storage and take out the old e34. Going on 6 months of winter storage ugh
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Old Sun, Apr-15-2018, 04:59:07 PM   #6
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Default Re: PSA - Change your fuel filters!

Do you still have the old fuel filter? You should cut it open with a hacksaw just to see how bad it looks inside. The fuel filter is an an all too commonly glossed over maintenance item on cars.
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Old Sun, Apr-15-2018, 05:16:02 PM   #7
icanseeyou
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Default Re: PSA - Change your fuel filters!

Quote:
Originally Posted by breadvan View Post
Do you still have the old fuel filter? You should cut it open with a hacksaw just to see how bad it looks inside. The fuel filter is an an all too commonly glossed over maintenance item on cars.
Still got it, yes, just a little hesitant to cutting it open before it airs out a little bit, just to prevent anything catching on fire. I might do it later on today and post pictures!
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Old Sun, Apr-15-2018, 05:25:09 PM   #8
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Default Re: PSA - Change your fuel filters!

I change it yearly.. i mean,what?
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Old Sun, Apr-15-2018, 06:59:21 PM   #9
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Default Re: PSA - Change your fuel filters!

The forum won't let me post pics a second time, here are the pics of the original fuel filter that I cut open last fall. http://www.m3forum.net/m3forum/showthread.php?t=594297
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Old Mon, Apr-16-2018, 07:29:22 PM   #10
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Default Re: PSA - Change your fuel filters!

curious to see what a plugged filter looks like inside. Iíve been in debates with people on other forums about importance of fuel filters and crud inside tank from bad gasoline. this is just another confirmation of this.
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Discussing PSA - Change your fuel filters! in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)