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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-17-2006, 04:48 PM
hishamrazzak hishamrazzak is offline
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Mein Auto: 520 BMW
Question A wierd fuel leak

Hi Guys,
I got a weird fuel leak coming out some where under the car /under passenger front seat.
I got 520i 2002, similar to 525. The leak happened only once, I left the car for 4 days unattended inside garage and when started engine yesterday I smelled petrol and found the fuel was leaking , I took the for a spin and back . Leak stopped completely. No leak this morning or even at work’s parking area. I sneaked under car and looked through plastic cover using a torch, I saw a thin black hose and some kind of cylinder or some thing similar as I couldn’t see the whole stuff due to the plastic cover. The area is very very dry you cant even smell the petrol. The leak was really bad , about 10 drops/second….now no leak.. any advice is much appreciated.
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Old 01-20-2006, 07:02 AM
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psychop psychop is offline
Fastest 528iA in the EU;)
Location: Warsaw, Poland
 
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Intermittent nature of this leak may suggest that it's not the main fuel circuit leaking.
It could be the fuel tank venting system letting some fuel through. You need to pull
the covers and carefully inspect all fuel system components - risk of fire!
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  #3  
Old 01-20-2006, 08:42 AM
KTrostel KTrostel is offline
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I recently had a petrol leak that was as significant as you described. For weeks I smelled petrol fumes but there was no apparent leak. The leak was only discovered after I had filled the tank up then the leak was pronounced! Turned out that the gasket sealing the fuel pump access panel - located on top of the fuel tank and accessed through the interior of the my 540i -was the problem. Replaced the gasket - no more problem. Obviously there are a number of potential problems but this is one place to look.
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Old 01-20-2006, 12:55 PM
hishamrazzak hishamrazzak is offline
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Many thanks Gents..points taken & checked all componenet , seems some clamps need to be tightened.
I got another question?
the car drips oil, very minimal, one or 2 drops /day when i move car from garage.
i looked under the car + oil type and can confirm that the leak is comng from gear when meets with engine , and the oil is the transmission oil/gear. Is it serious? do i need to fix it ?
the car under full mech warranty for anoher 2 yrs, but i dont want the mechanics to mess around and i might get bigger issues after fixing( happened b4) as long as the problem is not serious and i can live with it - although wife giving me a hard time to clean drops :-(
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Old 01-20-2006, 06:46 PM
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psychop psychop is offline
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Well, if this is the transmission oil leaking i'd be definitely looking into fixing this ASAP.
Mostly because, unlike as in the engine, there is no reliable way to check oil level in
the transmission on daily basis
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Old 01-20-2006, 07:10 PM
hishamrazzak hishamrazzak is offline
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thanks psychop..i will consider your advice and see garage on Monday...Regards
Is there any Diagnoses the gear indicates the need to be checked b4 failing...in other car-Nissan Maxima- the auto trans gave me a good cry to add oil!
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