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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 05-17-2013, 11:36 PM
KennySA KennySA is offline
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Location: South Africa
 
Join Date: Jul 2012
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Mein Auto: 1999 BMW 740i E38 M62
fuel leaking from fuel tank

I drive a 1999 740i. Fuel leaks from my fuel tank on start up and stops after a few minutes. The leak is severe as it leaves a pool of fuel on the floor.The fuel flows from the top of the fuel tank. This does not occur every time and is intermittent, but will usually always happen when the car has not been driven for a few days.
I have removed the rear seat and inspection cover and cannot find any evidence of leaking fuel and the feul line and hose are fine. If it was a split or damaged return fuel line or hose it would then leak continously. Iam affraid to drive my 740 because of the fire hazard by the leaking fuel.
Please can anybody give me advice how to fix this.
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  #2  
Old 05-18-2013, 07:03 PM
Mayorchuck Mayorchuck is online now
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Mein Auto: '96 740iL
Did you check the other top cap on the drivers side?
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  #3  
Old 05-20-2013, 09:42 PM
KennySA KennySA is offline
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Mein Auto: 1999 BMW 740i E38 M62
No I did not check this. How would fuel leak from there? Iwill check next time and let you know
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  #4  
Old 05-20-2013, 09:50 PM
Mayorchuck Mayorchuck is online now
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Mein Auto: '96 740iL
Well, it really shouldn't but I had a leak there. There is a fuel level sensor on that side. The top plate that the sensor is attached to has a gasket that was leaking on mine. It usually only happened when the tank was close to full. I doubt this is your issue but it is easy to check.
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  #5  
Old 05-21-2013, 07:19 AM
KennySA KennySA is offline
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Location: South Africa
 
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Mein Auto: 1999 BMW 740i E38 M62
I did remove the rear seat and checked the sender cover and fuel line and hose for leaks and all was good. This leaking fuel occurs with the fuel tank full or even if the fuel level is low. The fuel leak does not occur every time.
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  #6  
Old 05-22-2013, 06:18 PM
JasonSC540ia JasonSC540ia is offline
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Mein Auto: 1999 740i
Put the car in the air and inspect the fuel lines coming from tank to filter/regulator, and return fuel line. Sounds like return line to me.
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  #7  
Old 05-23-2013, 07:39 AM
KennySA KennySA is offline
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Location: South Africa
 
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Mein Auto: 1999 BMW 740i E38 M62
I did check the fuel lines under the car right to where they go up to the fuel tank and are good to that point. There is a section of line which I cannot check and will have to drop the tank to do this. I only want to remove the fuel tank as a last resort. Iam hoping someone can help me fix this without having to drop the tank.
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  #8  
Old 04-02-2014, 02:44 AM
KennySA KennySA is offline
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Location: South Africa
 
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Mein Auto: 1999 BMW 740i E38 M62
The fuel leak started to leak every time I drove the car, which made it easy to find the source of the leak. The leak is coming from a short piece of hose about 4 inches long which connects the fuel pump outlet above the fuel tank. Now I want to try and replace this short piece of hose without dropping the tank, and I want to use springs clamp to secure the hose.
Anyone have advice for me please.
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  #9  
Old 04-02-2014, 03:10 AM
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ebida3 ebida3 is offline
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Mein Auto: 2001 740iL
Have patience!
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