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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 01-17-2013, 03:41 PM   #1
Ianrobertwood
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Fuel leak in e46 330i

I recently tried to fill the car up at the garage. Once I had paid and returned to the car realised that the fuel was steaming out onto the floor. It was coming from under the back seat passenger side. I left it for 20 minutes and then it stopped. Lost half a tank of fuel . It never came out again after that as I'm scared to fill it up again. Any ideas what it can be??
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Old 01-17-2013, 03:45 PM   #2
Stinger9
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Urgent to not drive obviously, and get inside and under the car to visually inspect.
Plastic tanks don't rust, and I know of no fixtures that attach into the tank except from the top.
So I'm guessing something punctured your tank from underneath if you lost that much gas. I suspect one side of your saddle tank is now empty.

http://realoem.com/bmw/showparts.do?...72&hg=16&fg=05

Last edited by Stinger9; 01-17-2013 at 03:54 PM.
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Old 01-17-2013, 03:49 PM   #3
trj
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Thats dangerous. Get it towed and get it checked ASAP.
DO NOT try to start the car.

Something obviously hit the gas tank and punctured it. Or you were not filling it up right(which I really dont think is the case).
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Old 01-17-2013, 03:58 PM   #4
Ianrobertwood
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If I had punctured the tank I thought I would have lost more fuel. I had the garage take a look at it and they couldn't find anything wrong with the tank.
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Old 01-17-2013, 04:03 PM   #5
trj
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Originally Posted by Ianrobertwood View Post
If I had punctured the tank I thought I would have lost more fuel. I had the garage take a look at it and they couldn't find anything wrong with the tank.
Depends on where you were loosing fuel from.
Whatever the case is, I would take it for a real thorough check up.
Petrol is not something I would take lightly if its leaking.

Also try filling it up again little by little, may it was the fuel nozzle not sitting properly inside the tank.
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Old 01-17-2013, 04:18 PM   #6
Ianrobertwood
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Cool. I will try that. Hopefully it's not. Big job and don't cost to much. Thanks for the advice.
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Old 01-17-2013, 04:19 PM   #7
Stinger9
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Originally Posted by trj View Post

Also try filling it up again little by little, may it was the fuel nozzle not sitting properly inside the tank.
Signs at my gas stations say not to leave car fueling unattended.
I stay right next to the hose the whole time the gas is flowing.
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Old 01-17-2013, 04:24 PM   #8
trj
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Signs at my gas stations say not to leave car fueling unattended.
I stay right next to the hose the whole time the gas is flowing.
Same here as well and I do stand outside while fueling up. But most of the places in UK are pay inside fill outside. And in some other countries, people will fill your tank, you gave them money. They will be standing right at the nozzle.
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Old 01-17-2013, 04:27 PM   #9
Ianrobertwood
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When I was fuelling I didn't leave the pump once. They have taken of the lock mechanism on the fuel pumps here in uk so I can't do that. Someone said that there is seal underneath the back seats that is for the fuel tank and that may be faulty.
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Old 01-17-2013, 04:33 PM   #10
Stinger9
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Look at the picture of the gas tanks I posted a link to.

Under the rear seats are two gasketed openings for the pump and senders.
Lift the rear seat for easy access.
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Old 01-17-2013, 04:36 PM   #11
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Originally Posted by Stinger9 View Post
Look at the picture of the gas tanks I posted a link to.

Under the rear seats are two gasketed openings for the pump and senders.
Lift the rear seat for easy access.
+1

I thought you already checked those OP.
If you havent then get going on that.
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Old 01-17-2013, 04:38 PM   #12
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Excellent. I will try that.
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Old 01-17-2013, 04:51 PM   #13
Stinger9
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rear seat pulls up in front. no screws.

Then wiggle out of tight fit. At least in my coupe with no doors.
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Old 01-17-2013, 05:06 PM   #14
Ianrobertwood
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Will I be able to see it once I got the seats out?
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Old 01-17-2013, 05:22 PM   #15
Stinger9
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You'll be looking right at the top of the fuel tank.

search on youtube for e46 fuel pump replacement vids.
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