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General E46 Forum
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Old 01-07-2016, 12:33 AM   #1
masruque
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HELP ! Fuel pump gone bad or not getting power.

Guys,

I am in desperate need of help and I have been combing the forums for answers.

I have a 05 325ci which was driving perfectly until suddenly she started bogging down and stuttering as if she was running out of gas. I stopped her on the middle of the highway and the car wouldn't start back on. She turns on and keeps cranking but just will not turn on. There were no codes thrown also.

After looking up on the forums, I suspected it's the fuel pump. So I measured the voltage at the fuse which as 11.6V and then at the relay which was 11.6 V and also on the fuse on the e-box under the hood which was also the same. But the voltage on the plug is coming to be 4.7V. The fuel pump does not prime or make any sounds when I turn the key on. I also measured the voltage on the other plug on the pump behind the driver, and that is also at 4.7V.

I am not sure now if the fuel
Pump actually has gone bad or if it is not getting enough power. What should I do next ? Please help!
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Old 01-07-2016, 01:15 AM   #2
BaliDawg
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If your system voltage is that low, 11.6V, you'll see a lot of strange behavior. It should be 12.4V to 12.6V typically.
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Old 01-07-2016, 01:31 AM   #3
jmo69
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Voltage at the plug drops after about 5 seconds, if you can't hear it prime it's most likely dead. If there's enough power to crank the engine there should be enough to power the pump. See if it fires with some starting fluid.
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Old 01-07-2016, 06:03 AM   #4
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Car needs a fuel pump. DO NOT worry about measuring Voltage at the pump, IT WILL be lower than 12.6 Volts, you will also read around 5 Volts when the pump is not running.

Replace the pump, no question.

Read this thread - http://forum.e46fanatics.com/showthread.php?t=929501

$130 for a OEM pump and sending unit on your doorstep from www.bmaparts.com using discount code SPEC30 and free standard shipping you can usually get the pump in 2 days.
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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 01-07-2016, 07:55 AM   #5
masruque
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Thank you guys ! Do you think it will help if I put the car on a jumper cable with another car or a starter pack and then check the voltage.

I will follow your advice and replace the fuel pump regardless.
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Old 01-07-2016, 08:39 AM   #6
markusmarkus
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In a word "NO"! Replace the fuel pump!!
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Old 01-07-2016, 09:28 AM   #7
masruque
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Sounds good !
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Old 01-07-2016, 10:28 AM   #8
jmo69
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Sometimes giving the tank a smack will get the pump going long enough to get the car home. Changing the pump can be done anywhere without any 'specia.l' tools.
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Old 01-07-2016, 10:37 AM   #9
masruque
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I will try it. But since this was my second incident as such, I doubt it will turn on. I just wanted to make sure I did my due diligence and check every possibility before pulling the pump out.
I had to call roadside assistance and tow the car home since I was stuck in the middle of no where on US-84. I have everything ready to switch out the fuel pump. Just waiting for the part.
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Old 01-07-2016, 10:49 AM   #10
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Just remember to put the sealing ring in place first, it will make the install go easier. Ask me how I know.
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Old 01-07-2016, 11:24 AM   #11
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Quote:
Originally Posted by masruque View Post
I will try it. But since this was my second incident as such, I doubt it will turn on. I just wanted to make sure I did my due diligence and check every possibility before pulling the pump out.
I had to call roadside assistance and tow the car home since I was stuck in the middle of no where on US-84. I have everything ready to switch out the fuel pump. Just waiting for the part.
Make sure you have 1 small worm drive hose clamp, you will need to cut the original off.

You can take the butt of a hammer and tape on the pump mounting ring pretty stoutly and this may jar the pump into running. The brushes wear then do not make good contact, this is they the pumps go soft and/or quit running.

Also make sure you have 3/4 tank or less of fuel, otherwise you will have a fuel leak when you pull the pump.
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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 01-07-2016, 11:34 AM   #12
masruque
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Sounds Good. I will try tapping it to see if it does anything. I have about 1/2 tank of gas remaining in the car
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Old 01-07-2016, 01:00 PM   #13
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Seal ring goes on the fuel pump at about the middle of it.
insert the fuel pump sock in first, then when you have inserted the fuel pump into the tank about half way, now push the seal ring so that it is firmly on the tank. This side down always goes down!

Finally, pUT your pump all the way down makin sure the seal ring is still in tack and sealing properly.
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Old 01-08-2016, 12:50 AM   #14
masruque
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OK guys, the fuel pump was definitely the culprit. I replaced it as instructed and the car fired up right away ! Thank you again for all the help !
Also just as a side note, I found it very useful to stuff some paper towels around the fuel hose to prevent any smell due to spillage.

Thanks again guys.
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Old 01-08-2016, 09:45 AM   #15
markusmarkus
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Ah, the sweet smell of success or gasoline, whatever!
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Old 01-09-2016, 04:30 PM   #16
kevman2
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Masruque,

I just had the same problem with my 2005 325ci. Changed out fuel pump, started right up. But my service engine soon light has not gone out. Did yours stay on, or go out?
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Old 01-10-2016, 09:33 AM   #17
masruque
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I had the service engine light on, but the first time this happened, I had to jump start the car and the light went away. The second time the pump died on me, the light never came on before the car died. I had scanned it for codes before replacing the pump but there were no codes found.

Last edited by masruque; 01-10-2016 at 10:59 AM.
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Old 01-10-2016, 10:43 AM   #18
jfoj
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Short story is a logic statement.

If you have an E46, Then it NEEDS a replacement fuel pump.

Live by these words or walk.
__________________
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 01-10-2016, 10:59 AM   #19
masruque
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Agreed with jfoj !

Kevman2, also you could scan the codes after replacing the pump and then clear them of all is running well
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Old 01-11-2016, 10:11 AM   #20
kevman2
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Just ordered a Peake scanner to check codes, and clear the sevice engine soon light. I'll let you know. I checked to make sure i installed correctly, and make sure the gasket was seated properly. All good...
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