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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 11-30-2004, 12:17 PM   #1 (permalink)
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I was driving my car the other day and its cold up here so i turned on the heat and i smelled fuel well it went away and then today i noticed at low RPM's between idle-2500 i get this really strong gas smell throught the heating vents but when i give it more gas and get above 2500 it goes away? ive only had the car 2 weeks so i dont know much about it in my belief could it be fuel filter,injector o-ring, but i dont see and fuel in the engine bay
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Old 11-30-2004, 03:58 PM   #2 (permalink)
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this has happened to both mine and my girlfriends car.... she got hers fixed i have not... what i think it was with hers was the pipes coming out of your gas tank were cracked or something and they lead under your back seat to where you feul pump is (if im not mistaken) which gives off the odor... can you smell it faintly outside of your car too sometimes... like when you warm up your car?

Hope that helps, take it to a bmw mechanic they see it all the time and can fix it!

David
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Old 11-30-2004, 04:58 PM   #3 (permalink)
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Quote:
Originally posted by 180kbim325@Nov 30 2004, 01:17 PM
I was driving my car the other day and its cold up here so i turned on the heat and i smelled fuel well it went away and then today i noticed at low RPM's between idle-2500 i get this really strong gas smell throught the heating vents but when i give it more gas and get above 2500 it goes away? ive only had the car 2 weeks so i dont know much about it in my belief could it be fuel filter,injector o-ring, but i dont see and fuel in the engine bay
[snapback]240329[/snapback]

Are you sure it is a pure gas smell? I thought that mine was gas as well, but it was the crankcase fumes exhausting under the hood rather than being burned off in the exhaust. Check your crank case ventalation hoses that go from your head cover at the front of the motor to the intake. there are 2 with the m50. One of the hoses on my 325 was cracked and the other just missing. Good luck!

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Old 11-30-2004, 05:03 PM   #4 (permalink)
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Quote:
Originally posted by 180kbim325@Nov 30 2004, 01:17 PM
I was driving my car the other day and its cold up here so i turned on the heat and i smelled fuel well it went away and then today i noticed at low RPM's between idle-2500 i get this really strong gas smell throught the heating vents but when i give it more gas and get above 2500 it goes away? ive only had the car 2 weeks so i dont know much about it in my belief could it be fuel filter,injector o-ring, but i dont see and fuel in the engine bay
[snapback]240329[/snapback]
Oh one more thing... the low RPM causes positive crank case pressure that will cause the fumes to vent under the hood. High RPM causes Negative pressure and stops the venting.
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Old 11-30-2004, 06:39 PM   #5 (permalink)
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THanx do you maybe have a pic so im sure with ones they are (im still a newbie)
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Old 11-30-2004, 07:17 PM   #6 (permalink)
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I had a similar problem which turned out to be a cracked fuel line on the top of the engine where there was a "T" connector. I was a very small leak which was only detected when I reved the engine. At a substantial speed I wouldn't smell it at all and no leakage appeared. Open the hood and manually advance the throttle and see if you notice any leakage around the gas lines, also (with the engine off) pinch the gas lines to see if there are any cracks noticable.
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Old 11-30-2004, 07:42 PM   #7 (permalink)
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Here is where the hoses connect on the crankcase side. This is basically taking the place of a conventional PCV valve. I have highlighted a picture of the M50 and where they are located.
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