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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 01-17-2016, 11:43 AM   #1
farvabeans
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Join Date: Sep 2015
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Check engine light + inconsistent idle + delayed gas response= failed fuel pump?

2004 325xi 122K

Bought it @ 116 - as far as I know the fuel pump has never been replaced. I replaced the fuel filter about 2K miles ago.

Car was driving perfectly last Wednesday. Left it in the garage since then and this morning I went to start it the troubles began.

Check engine light is on, very inconsistent idle - intermittent revving, and driving feels like I'm running out of gas. I could rev, but the actual acceleration seemed way off and the clutch was vibrating substantially.

Before I got too far down the road, I turned around and got her back to the garage safely. First thought is fuel pump failure. Any other ideas? Unfortunately I don't have a code reader on hand either.

Cheers!
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Old 01-17-2016, 12:09 PM   #2
jfoj
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Another owner without a code reader of any kind.

You want the OBDFusion App and the proper interface for your phone/tablet platform. Typically under $25 for the App and interface.

Without codes, it is all a guess.

As for fuel pump, could be the problem, but IMHO EVERY E46 should have the fuel pump replaced by now.

You may have had misfiring with fuel cut off due to a fuel pump or other problem.

Suggest you read the links in my signature and order an interface for your phone/tablet TODAY and then get OBDFusion.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-17-2016, 12:28 PM   #3
farvabeans
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Thanks jfoj, I'll update once I get an idea of what's going on.
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Old 01-17-2016, 12:35 PM   #4
jfoj
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Where in VA are you located?

If the fuel level was close to 1/4 tank, I would consider adding fuel and keep the fuel level above 1/2 tank before the fuel pump is replaced assuming the pump is going soft.

Vacuum leaks and misfires are quite common as these cars age.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-17-2016, 12:52 PM   #5
farvabeans
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Reston - I've gotta take her into the shop on Tuesday for some suspension work. Was going to have them diagnose then. Not sure how much gas is currently in the tank but I'll be keeping it above 1/2 tank until it's fixed.

Thanks for the suggestion.
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Old 01-17-2016, 12:57 PM   #6
jfoj
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Siemens/VDO fuel pump and sender assembly from www.bmaparts.com using SPECE30 discount code should be about $140 on your doorstep.

The pump replacement is a very easy DIY and can be performed from inside the cabin in under 30 minutes.

I would replace the pump even if it is not part of your current problem.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-17-2016, 01:07 PM   #7
farvabeans
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Yeah I'll be replacing it either way - do you know if the fuel line clamp for the FP is reusable or one time use like the oe fuel filter hose clamps?
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Old 01-17-2016, 01:42 PM   #8
swordsman11868
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Quote:
Originally Posted by farvabeans View Post
Yeah I'll be replacing it either way - do you know if the fuel line clamp for the FP is reusable or one time use like the oe fuel filter hose clamps?

Original ones are crimped so they're not usually reusable (unless you're really good at removing them).

Easier to just buy new ones.
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Old 01-17-2016, 01:44 PM   #9
jfoj
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Cut the original one use clamp and replace it with a small worm drive clamp.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-17-2016, 01:52 PM   #10
farvabeans
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Gracias, jfoj & swordsman.

Just FYI I found the Siemens/VDO FP on amazon w/ Reinz seal for $138 + free shipping. http://www.amazon.com/dp/B00D3PDCZ4/...=ITHMR9EOQR0JL .

Looks like it's actually sold by BMA parts via Amazon.
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Old 01-17-2016, 01:59 PM   #11
jfoj
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That is a awesome deal because the seal are usually like $20, but I reuse the original seals all the time without a problem.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-18-2016, 12:05 PM   #12
farvabeans
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Update: Started my car this morning to see if she was still acting up and she started perfectly.

No CEL, no gas delay, nothing. Drove it to work ~25 minutes and no issues whatsoever. I'll be keeping a close eye but will still be replacing the FP this week or next. I'll update if anything changes.
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Old 01-18-2016, 12:14 PM   #13
jfoj
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As cold as it is, you may want to check the bottom of the oil fill cap for Mayo and if it warms up enough you may want to swap the horn and fuel pump relay.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-18-2016, 12:35 PM   #14
franz
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Quote:
Originally Posted by swordsman11868 View Post
Original ones are crimped so they're not usually reusable (unless you're really good at removing them).

Easier to just buy new ones.
The original clamp is an Oetiker ear clamp and they are NOT designed to be reusable no matter how carefully you take them off.
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Old 01-18-2016, 02:27 PM   #15
jupiterntune
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Op you mentioned you did your fuel filter 2k miles ago. I learned to go back to the last and most recent thing altered on my vehicle for troubleshooting. Double check that it was replaced properly, facing the right way and that it's OEM etc ...
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Old 01-18-2016, 02:35 PM   #16
farvabeans
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Thanks Jupiter - I'm getting some suspension work done tomorrow at a local shop so I'll probably have them check over the fuel system while there at it. I have a feeling it won't be successfully diagnosed unless the CEL and related issues come back (fingers crossed they don't).
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Old 01-18-2016, 03:01 PM   #17
Citruz
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what would be the best app for my S5?

Hi jfoj,

I have a Galaxy S5, what is the best app for my smartphone? carly or OBDFusion? I need one that works perfectly for me.

Quote:
Originally Posted by jfoj View Post
Another owner without a code reader of any kind.

You want the OBDFusion App and the proper interface for your phone/tablet platform. Typically under $25 for the App and interface.

Without codes, it is all a guess.

As for fuel pump, could be the problem, but IMHO EVERY E46 should have the fuel pump replaced by now.

You may have had misfiring with fuel cut off due to a fuel pump or other problem.

Suggest you read the links in my signature and order an interface for your phone/tablet TODAY and then get OBDFusion.

Last edited by Citruz; 01-18-2016 at 03:02 PM. Reason: bad grammar
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Old 01-18-2016, 04:25 PM   #18
jfoj
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Quote:
Originally Posted by Citruz View Post
Hi jfoj,

I have a Galaxy S5, what is the best app for my smartphone? carly or OBDFusion? I need one that works perfectly for me.
You want to start with OBDFusion and a Bluetooth interface.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-19-2016, 02:06 PM   #19
farvabeans
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Got the codes checked - 1 was due to a faulty gas cap not holding vacuum properly and the other was due to a loose 6th cylinder spark plug. Getting both fixed today.

Thanks for the help, all!
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