air on return fuel tube - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 06-10-2007, 05:07 PM
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air on return fuel tube

I got a 320i 1985 ,sometimes starting it isn't easy.
When hot and with the gas tank full,when the pump starts I can hear a loud bubling inside the tank.
But i already put a small clear tube between the fuel filter and the injection ramp and can't see no air passing so I'm assuming it isn't coming from the pump.
Is this normal ?
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#2 (permalink) Old 06-11-2007, 12:26 AM
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Most likely it's the sound of return fuel from the regulator pouring back into the tank. However it's odd that you can hear it so loud.
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#3 (permalink) Old 06-11-2007, 03:40 PM
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When the engine is running ,and with a clear tube on the exit of the pressure valve regulator I can see very small bubbles coming from it.witch I can't understand why ,because like I said i do not see it coming from the pump. About the sound it's like if you blow on a tube inside a bucket,some times after the pump works and stop,if turn the key off and on I still have a little more bubbling.
Otherwise works ok.

Thank you.
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#4 (permalink) Old 06-12-2007, 07:06 PM
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Very unusual. Does your fuel return line get close to the exhaust?
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#5 (permalink) Old 06-24-2007, 06:40 PM
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No the fuel lines go near the driver side ,every thing is standared.
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