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Old 08-11-2016, 06:09 PM   #1
Kye7
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Fuel leak under car, possibilities?

Hey guys. 2003 330xi here. 120k miles.
I replaced the fuel FILTER about a year ago, no problems.

For the past month or so, when I turn the car on in the morning, I can smell gas. Inside, outside, and around the car. Seems the level of fuel (full/empty tank) does not matter.
I changed my Fuel injector O-Rings as I thought they could be leaking. This was not the problem.

I suspect either my fuel filter hose clamps are becoming lose, and leaking, or my fuel PUMP is going bad, or the gasket that hold it is going bad. I noticed a large pool of gas this morning as I left my driveway.

I wanted to know if anyone else had this problem, and if they knew the remedy. I want to start with the easiest solution before getting more involved.

Pictures here: This was this morning, and I had started the car for about 3 minutes. Gas smell was very much present. This is in the middle of the car undercarriage, around the skid plate.

EDIT - SOLUTION!
The car was leaking gas because the hose clamps (that were replaced upon replacement of fuel filter) to the fuel filter were not tight enough.
This was remidied by removing the undercarriage cover, and fuel filter cover, and tightening all hose clamps by the fuel filter.
It appeared to be leaking on the other side of the car, because fuel was flowing onto the undercarriage cover, and dripping away from the filter.
The clamps were tightened, the engine was ran for 5 minutes to ensure no leaking fuel was present.
Solved!
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Last edited by Kye7; 08-12-2016 at 03:05 PM. Reason: Fixed!
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Old 08-12-2016, 07:53 AM   #2
markusmarkus
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There's no fuel line on the passenger side of the car!!! How could that be gasoline? Open the hood and find the source (scratches head).
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Old 08-12-2016, 08:59 AM   #3
Solidjake
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Interesting, and I agree with Markus, no fuel on the passenger side. Did you touch the liquid to check what it was?
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Old 08-12-2016, 09:39 AM   #4
ms9876543
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If the wheel in the picture is the front passenger, then the picture appears to be taken from the driver side.

I'd figure its the short hoses that attach the fuel filter to the hard lines. 'Normal' rubber would dissolve in about a year if your fuel has a high ethanol content, you really need to use SAEJ30R9 hose for those sections.

Either way, it should be simple to spot, two lines run from the tank to the filter and one hose goes from the filter to the (returnless) fuel rail. The upper part of the Filter to Rail hose is flexible, but I'd consider that a lot less likely to leak than the fittings at the filter.
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Old 08-12-2016, 10:15 AM   #5
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Yup, as others have said, it's most likely the hoses connecting your filter to the hard lines. I had the exact same issue after I changed my filter. I didn't tighten down the clamps enough and it would leak gas when running. Went back under there and gave them another tightening, and all fixed. Make sure you are using new clamps and not reusing the old ones. And like the others have said, make sure that you are using the correct type of hose.
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Old 08-12-2016, 01:09 PM   #6
Silverdogz
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Quote:
Originally Posted by ms9876543 View Post
If the wheel in the picture is the front passenger, then the picture appears to be taken from the driver side.

I'd figure its the short hoses that attach the fuel filter to the hard lines. 'Normal' rubber would dissolve in about a year if your fuel has a high ethanol content, you really need to use SAEJ30R9 hose for those sections.

Either way, it should be simple to spot, two lines run from the tank to the filter and one hose goes from the filter to the (returnless) fuel rail. The upper part of the Filter to Rail hose is flexible, but I'd consider that a lot less likely to leak than the fittings at the filter.
Eh, it's often difficult to find SAEJ30R9. I used Gates MTP fuel hose which is rated for gasoline/ethanol and for 225PSI. It is rated as SAE J3OR14T2. Anyway the part number is 27340 at O'Reilly auto parts and it'll work for the fuel filter hose.
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Old 08-12-2016, 02:07 PM   #7
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Looks like a fuel leak to me, the fuel system is the only system that could develop that kind of pressure in that location. Don't drive it.
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Old 08-12-2016, 03:02 PM   #8
Kye7
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Solution is in Original post, thanks for the comments guys!

I figure someone else will have this problem in the future, figured I'd document it. It was very easy to do.
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Old 08-12-2016, 03:11 PM   #9
Radnor
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Quote:
Originally Posted by Kye7 View Post
Solution is in Original post, thanks for the comments guys!

I figure someone else will have this problem in the future, figured I'd document it. It was very easy to do.
Big congratulations on solving it!
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Old 08-12-2016, 04:09 PM   #10
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Wow, I always figured the hoses are so snug that it would never leak, even without hose clamps at all.
Did you notice the hose was slightly removed?
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Old 08-13-2016, 01:33 AM   #11
Kye7
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Originally Posted by OnTheFence View Post
Wow, I always figured the hoses are so snug that it would never leak, even without hose clamps at all.
Did you notice the hose was slightly removed?
Hoses not moved at all.
When I replaced the filter a year ago, I broke off the old brittle hoses, and replaced it with new vacuum hose or something of the like. I got 6 small hose clamps and used those. I was able to give them 1-3 turns, which I thought was quite a bit.
I hope I have made them snug enough to last longer.
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Old 08-13-2016, 08:12 AM   #12
OnTheFence
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Wait, did you use "fuel hose" or "fuel injection hose"
There is a difference. The latter is a high pressure hose that is not as spongy.
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Old 08-27-2016, 05:53 AM   #13
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Update?
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