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Old 07-28-2013, 04:53 PM   #1
bmwlove401
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fuel pump help

Hello everyone!! I need some HELP, I have an 04 330xi and I believe my fuel pump just broke and I want to replace it my-self but I am wondering if there is any chance it could be something stupid like a relay or fuse and how I check or find them??? thanks
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Old 07-28-2013, 05:15 PM   #2
Foxtrot_Uniform
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There are lots of diagnostic threads for testing your fuel pump here and on Google. Look them up and test it.

Do you hear the pump cut on when you turn on the ignition? How many miles? What are your symptoms?
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Old 07-28-2013, 05:41 PM   #3
2003silver330i
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Quote:
Originally Posted by bmwlove401 View Post
Hello everyone!! I need some HELP, I have an 04 330xi and I believe my fuel pump just broke and I want to replace it my-self but I am wondering if there is any chance it could be something stupid like a relay or fuse and how I check or find them??? thanks
Your best bet is to pull up the back seat and put your ear against the fuel pump while someone turns the key to position 2 to hear the whine.
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Old 07-28-2013, 09:02 PM   #4
Entropyyy
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fuel pump help

If your fuel pump is gone you won't even be able to drive


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Old 07-28-2013, 09:07 PM   #5
WDE46
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If your fuel pump is gone you won't even be able to drive


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If the relay blew, then he can't drive either.

OP, best thing to do is to diagnose the pump. If it's the pump, then go ahead and replace that AND the relay too.
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Old 07-29-2013, 07:09 AM   #6
bmwlove401
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RE:fuel pump

THANKS for the help ppl.. I was told to check the #52 fuse and that should be for the fuel pump? and also are all the relays in that black box on the driver side under the hood? Ya my car wont start I sprayed some started spray into the intake manifold and it started up like a champ I just gotta make sure its not a relay so I need to know where they are and which one is for the fuel pump??

THANKS
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Old 07-29-2013, 07:53 AM   #7
jfoj
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Re: fuel pump help

Fuel pump relay is behind the glovebox. I recall its green?? Swap the 2 same color relays behind the glovebox.

But suggest you replace the fuel pump anyway.

Check the 2nd link in my signature.
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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

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Old 07-29-2013, 08:10 AM   #8
mcurcio1989
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If you have a multimeter it is really easy to check and see if you are getting power to the pump. When my pump went out it was kind of intermittent. What I ended up doing was popping the seat of and verifying that it wasn't pumping which was very easy. With the seat off you you should easily be able to hear the pump. if it is not pumping pop the plug off and check for power to it. Just get a good ground on the car and then go through and see if any of the prongs have power. As I recall there was 3, a ground, a signal for the gauge, and power to the pump. There could be another that I am forgetting tho. On mine right when the car was switched on it would give it power so I knew I had the right one and that it was the pump.

As far as changing the pump it is the easiest thing ever. Just make sure your tank isn't all the way full. As long as the gauge is off of the full point you shouldn't have a problem. It is pretty much a 5 minute job.
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Old 07-29-2013, 08:23 AM   #9
WDE46
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Originally Posted by bmwlove401 View Post
THANKS for the help ppl.. I was told to check the #52 fuse and that should be for the fuel pump? and also are all the relays in that black box on the driver side under the hood? Ya my car wont start I sprayed some started spray into the intake manifold and it started up like a champ I just gotta make sure its not a relay so I need to know where they are and which one is for the fuel pump??

THANKS
I think it's suggested not to use starter fluid on these cars. You could blow the intake manifold apart.
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Old 07-29-2013, 08:26 AM   #10
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Quote:
Originally Posted by mcurcio1989 View Post
If you have a multimeter it is really easy to check and see if you are getting power to the pump. When my pump went out it was kind of intermittent. What I ended up doing was popping the seat of and verifying that it wasn't pumping which was very easy. With the seat off you you should easily be able to hear the pump. if it is not pumping pop the plug off and check for power to it. Just get a good ground on the car and then go through and see if any of the prongs have power. As I recall there was 3, a ground, a signal for the gauge, and power to the pump. There could be another that I am forgetting tho. On mine right when the car was switched on it would give it power so I knew I had the right one and that it was the pump.

As far as changing the pump it is the easiest thing ever. Just make sure your tank isn't all the way full. As long as the gauge is off of the full point you shouldn't have a problem. It is pretty much a 5 minute job.
There are actually 4 wires! 2 for the pump and 2 for the level sensor.

Just put your multuimeter on the 2 connectors right next to each other. When you turn the key on, you should see 12v for about 12 seconds.
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Old 07-29-2013, 08:28 AM   #11
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the fuel pump is loud... if you are in a quiet place (radio/hvac off, no traffic noise, etc...) you can keep your windows down or doors open, and when you turn the key to ignition 2, you can hear it "hiss" for a few seconds

definitely easier to hear by just popping up the rear seat, but not necessary since you can hear it out of the car... hell... put the key in from the passenger side then put your ear next to your rear right tire... would be clear as day from there
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Old 07-29-2013, 08:38 AM   #12
BMANN405
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fuel pump help

How many miles are on the car? If your over 100,000 I'd go ahead and replace fuel pump relay and the pump. Relay is behind the glove box so you have to remove glove box to get to it but it is easy. Fuel pump is also simple. Should only take you about 30 minutes. Under back seat passenger side. If I can do it anybody can do it.

If not too many miles on the car try changing the relay first. Good luck!


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Old 07-29-2013, 05:43 PM   #13
bmwlove401
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Thanks for the advise everyone the procedure was really easy and I was successful, I'm glad you guys are here, I almost lost it not having a car sucks on my b-day too... GLAD I got my baby back THANKS AGAIN EVERYONE...
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