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General E46 Forum
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Old 11-05-2013, 07:17 PM   #1
add70816
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Join Date: May 2010
Location: Baton Rouge, Louisiana
Posts: 24
My Ride: 2001 330Ci
replaced the fuel filter and pump and now the car is running a rough idle! HELP!

Hello, I have a 2001 BMW 330CI and i've replaced the fuel filter and fuel pump, now the car has a huge power lost, really rough idle and wont start unless i slam on the gas pedal in the morning. i have a cable tie holding the vacuum tube connecting to the fuel pump, i was told that may be the issue. the original fuel pump went out and the car wouldnt start until i put the new one on! the car ran fine for weeks but now im having that issue i stated up above! is there anyone who can help and tell me what i could possibly do to fix it!
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Old 11-05-2013, 07:34 PM   #2
jfoj
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Doubt is is the fuel pump, but you could check the fuel pressure and volume to confirm. Was the fuel sender gasket properly installed?

Would be concerned about the fuel filter and/or the vacuum line that connects to the fuel filter.

I assume you have a CEL/SES/MIL light on? If so, you need to have the codes read and check the Freeze Frame data.

If you do not have a scan tool or a tool that support Freeze Frame data, read this - http://forum.e46fanatics.com/showthread.php?t=967204

For other ideas, read the 1st link below in my signature.
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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 11-05-2013, 07:42 PM   #3
bmwbob89
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What brand of parts did you use?
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Old 11-05-2013, 07:47 PM   #4
jfoj
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Quote:
Originally Posted by add70816 View Post
i have a cable tie holding the vacuum tube connecting to the fuel pump, i was told that may be the issue.
After looking at this again, explain the above in more detail.

Did you purchase a complete fuel pump/sender unit or did you purchase only a pump from a local parts store and have to fit it into your original fuel level sender?
__________________
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 11-05-2013, 08:18 PM   #5
add70816
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Quote:
Originally Posted by jfoj View Post
After looking at this again, explain the above in more detail.

Did you purchase a complete fuel pump/sender unit or did you purchase only a pump from a local parts store and have to fit it into your original fuel level sender?
i have a mann filter and the pump is bosch. also i just replaced the cable tie with a hose clamp. it ran normal for about 15 minutes then started the rough idle again. also i'm getting the lean fuel code.
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Old 11-05-2013, 08:21 PM   #6
jfoj
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Probably coincidental??

Was the Bosch pump a pump/sender complete unit?

What codes do you have? P0171/P0174?

Probably a vacuum leak, but you could verify fuel pressure and volume with a fuel pressure tester. Most auto parts stores have them for loan.
__________________
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 11-06-2013, 06:55 PM   #7
add70816
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Quote:
Originally Posted by jfoj View Post
Probably coincidental??

Was the Bosch pump a pump/sender complete unit?

What codes do you have? P0171/P0174?

Probably a vacuum leak, but you could verify fuel pressure and volume with a fuel pressure tester. Most auto parts stores have them for loan.

Yes Sir, it is the pump and sender and those are the codes i'm getting, also i want to add that when i have my foot on the brake and press the gas i cant rev the engine like i could normally. has my fuel pump gone bad? because i changed the filter two weeks after the pump so could my old filter have made my new pump bad??
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Old 11-06-2013, 07:09 PM   #8
jfoj
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Doubt the pump is bad again, sometimes people connect the filter up wrong, most of the time they get no fuel, but I guess anything is possible with the wrong connections.

You should be able to rent/borrow a fuel pressure tester from most AutoZone/Advance stores. You need to check both pressure and pump volume.

Plenty of things make the engine run lean, however, vacuum leaks are usually minimized off idle and do not cause a lack of power.
__________________
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 11-07-2013, 07:32 PM   #9
add70816
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Join Date: May 2010
Location: Baton Rouge, Louisiana
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Quote:
Originally Posted by jfoj View Post
Doubt the pump is bad again, sometimes people connect the filter up wrong, most of the time they get no fuel, but I guess anything is possible with the wrong connections.

You should be able to rent/borrow a fuel pressure tester from most AutoZone/Advance stores. You need to check both pressure and pump volume.

Plenty of things make the engine run lean, however, vacuum leaks are usually minimized off idle and do not cause a lack of power.

ok, so i just had the car scanned and i got these two codes p0505 and p0102! any ideas guys?
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Old 11-07-2013, 08:17 PM   #10
lszlszx
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Disconnect the MAF briefly to see if the idle changes. Other than that, recheck your work make sure everything has been connected properly and look for vacuum leaks.
If it runs good at higher rpm, fuel delivery is good.
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