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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 12-27-2012, 12:07 AM   #1
bronxbomerss2
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no start fuel pump failure? help please!

ok so on the other day i went to go start the car ( 05 325ci) and the engine kicks over but doesn't start. The first thing i checked since i was the quickest and easier was to listen for the fuel pump to turn on or prime. heard nothing, so i removed the back seat to get a better listen. still nothing, so i checked the fuse under the hood, that was fine, checked the fuse in the glove box that was fine also, from what i understand the relay is also in the glove box and its the green one all the way to the left? i held my finger on it while i turned the key and felt the "click" so i presume all is well there. So lastly i removed the rear seats and checked the voltage going to the fuel pump connector. read around 12v. I reasonably concluded my fuel pump had failed so i went out and got a new one. Now before i went ahead and started to take out the old pump i plugged the new one in and turned the key but nothing happened, no sound, no movement, nothing! I am at a loss right now, not sure what the problem could be?? i think i checked everything, the only thing i might need clarification on would be the relay. Any help would be much appreciated as i haven't been on the road for a couple days now! thank goodness for xmas break!
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Old 12-27-2012, 12:18 AM   #2
tatboy
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Not for nothing, but why did you suspect the fuel pump right away?

Did you try disconnecting the fuel line from the fuel rail and aim it into a safe container, then turn the car over and see if fuel is pumping out the hose?

If so, then your fuel pump is functioning properly and you can look to other issues as the main cause

ie: MAF connector disconnected, no spark, a blown fuse (check them ALL, not just the one u think would cause your issue)

Last edited by tatboy; 12-27-2012 at 12:28 AM.
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Old 12-27-2012, 07:46 AM   #3
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Old 12-27-2012, 08:50 AM   #4
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If your engine is not started right away, the dme will only turn the fuel pump on for 3 seconds. Check your connector voltage again and see if you see the voltage go to 12 v then turn off.

Were you right next to the pump in the back seat?

Maybe you can install it and try to start the car.
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Old 12-27-2012, 03:58 PM   #5
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i was right next to the fuel pump in the back seat when i turned the key to start and head or felt nothing, i just checked the voltage from the battery on the cluster and read 11.9 and when i cranked the engine it dropped to like 10.8. if that is any indication of anything
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Old 12-27-2012, 04:46 PM   #6
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Ok so I tried jumping the car still nothing just keeps trying to turn over so I know the starter is fine the battery isn't the issue bc I tried jumping it. I then tried using starter fluid and got nothin so I'm at a loss?? I don't believe it's a loss of spark since I don't believe all 6 spark plugs went bad all at once ? Any sort of help would be greatly appreciated
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Old 12-27-2012, 04:57 PM   #7
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Did you use enough starting fluid?

Try holding the throttle to the floor when cranking, this puts engine in clear flood mode in case you flooded the engine.
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Lower hose fan switch O-ring - BMW #13621743299
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Old 12-27-2012, 07:00 PM   #8
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yeah i used 2 sprays worth of starter fluid for about 5 seconds each spray and i held the gas pump to the floor just in case. i sprayed it through the plug in the elbow of the intake, im at a loss for where to look now, i know the battery or starter isn't the problem, i don't have a SEL on so i don't believe its the CPS. I used starter fluid and the car is in the garage now which is heated so i don't believe and fuel lines are frozen. I don't think all 6 spark plugs went bad all at once over night. the only thing i can think of is maybe some type of theft thing that wouldn't allow the engine to start? idk :/ i don't know where else to look, thanks for the replys guys!
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Old 12-27-2012, 07:52 PM   #9
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I replaced mine last week. As jfoj says, replace it and see if it works.
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Old 12-27-2012, 08:02 PM   #10
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i would have replaced the fuel pump if i would have heard a buzzing sound once it was plugged in so i don't understand why it didn't turn on once the key was turned to the start position, so both the old and the new pump weren't turning on yet i have 12v running to the pump connector so i believe it is getting power and that it isn't a relay or fuse issue.
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Old 12-27-2012, 08:05 PM   #11
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Check all your e-box fuses.

Anti-theft would Mot allow the car to crank, so you should be ok for the ews.
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Old 12-27-2012, 08:42 PM   #12
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Sorry to sound dumb but what do you mean by ebox?
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Old 12-27-2012, 09:14 PM   #13
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Was the pump in an upright position when you tested it?
Maybe if the float is all the way down it will not pump?
Maybe it won't pump because it is dry?
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Old 12-27-2012, 09:20 PM   #14
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Do you by chance have an aluminum housing for your thermostat?

Or do you have the stock plastic thermostat housing?
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 12-27-2012, 09:21 PM   #15
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Just as another cheap test, switch the fuel pump relay with the horn relay. They are both light green and are right next to each other behind the glove box, and are the same relay. Possibly a faulty, but not 'gone' relay?

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Old 12-27-2012, 09:28 PM   #16
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If there was no "money shift" and there was no response to starting fluid, then this would lead my to think you are not getting any ignition. If the fuel pump, even the new one is not running when plugged into to the connector when cranking then engine and you have no blown fuses I am starting to think you may have a bad crank sensor, however, a bad crank sensor should trigger a CEL.

As for the EWS, I cannot recall if it allows the engine to crank?? I think it does, do you have another key? Does anyone have PA Soft as you can tell if the key is being recognized with PA Soft.

INPA can command the fuel pump in via the software for a test as well.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 12-27-2012, 10:26 PM   #17
tatboy
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You may wish to answer the questions posed to you concerning whether or not you've PHYSICALLY pulled each and EVERY single fuse out of your fuse panel and VISUALLY checked them.

EACH and EVERY single one.

Also, did you check the connector that connects to your MAF (Mass Airflow Sensor) ? Thats the big black plastic object thats hose clamped onto your air intake. If the CONNECTOR thats connected to the MAF got disconnected, or your MAF itself is faulty, the vehicle would exhibit the same symptoms your presently experiencing.

Sounds electrical to me.

Occam's Razor - "All things being equal, a simpler explanation is better than a more complex one"

So check the simplest things first....

Last edited by tatboy; 12-27-2012 at 10:27 PM.
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Old 12-27-2012, 10:45 PM   #18
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The e-box refers to the box the DME is in. There are 5 fuses contained in it.
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Old 12-27-2012, 11:42 PM   #19
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I have not physically checked every single fuse but I have checked the r box or the 5 fuses that ate grouped together under the hood where the middle 20 amp one is the fuel pump one I believe. As for the maf sensor that's fine it's all connected and hasrnt been touched. When I checked the new fuel pump I had it laying sideways although I don't believe this would make a difference it should still buzz as I saw a YouTube video on an e46 with a guy changing his old pump and testing the new one before he put it in to make sure that was his problem and it buzzed laying sideways right away. Tomorrow I will check the fuel pressure at the fuel rail via the Schrader valve ( don't know if that's how you spell it ) is there anywhere else i can test fuel pressure from ?? Thank for the all the replies guys i can't say thanks enough for the suggestions and help !
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Old 12-28-2012, 03:21 AM   #20
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Long shot, but make sure the connector on the fuel pump is fully connected. I changed a fuel pump on my dad's truck and didnt pushed the connector all the way in. Spent an hr trying to figure out why the new pump wasnt priming. also make sure the battery has enough juice.

Last edited by evo7; 12-28-2012 at 01:06 PM.
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