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  #1  
Old 03-09-2010, 12:56 PM
xymox xymox is offline
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Location: Wisconsin
 
Join Date: Mar 2010
Posts: 2
Mein Auto: 2001 740i sport in silver
01 740i - Mystery sensor attached to oil filter

Hi, was checking under my hood the other day and I noticed a little sensor with a hose attached was making a fast clicking sound and I dont know if its normal or not. Im not even sure what the sensor is for but I'll try to describe it. Its attached via a bracket to the oil filter and is squarish looking and is pressed on from a top down configuration. There is an attached (could be a pump) devise on its underside with a hose (3/8" maybe) that runs to the front of the engine. What is this and is it normal to make a fast clicking noise?

Appreciate any responses.

btw, its a 2001 740i sport
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  #2  
Old 03-09-2010, 01:45 PM
M.Wong's Avatar
M.Wong M.Wong is offline
E38 E91 (R56 E30 E39)
Location: Seattle WA
 
Join Date: Jan 2003
Posts: 2,323
Mein Auto: The E38

(Photo by cyberdactly)

This, the fuel tank breather valve? Clicking is normal.
Possible P/N: 13-90-1-433-603, maybe 13-90-7-830-766 on the M5.




(Photo by J Irwan)
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M.Wong
E38 2000 740iL Orient Blue
E91 2012 328xiT Alpine White

Passed on to new families:
E30 1987 325i Royal Blue
E39 2003 540i/6 Sterling Gray
R56 2010 Mini Cooper S British Racing Green


  #3  
Old 03-09-2010, 02:03 PM
xymox xymox is offline
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Location: Wisconsin
 
Join Date: Mar 2010
Posts: 2
Mein Auto: 2001 740i sport in silver
Thanks for the quick reply. as long as the clicking is normal, I guess Im good to go.
Fuel Tank Breather valve? Seems odd to have some mechanical valve attached to the fuel tank. Is this just to compensate for any vacuum in the tank?
  #4  
Old 03-09-2010, 03:18 PM
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drivinfaster drivinfaster is offline
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Location: in the sticks you piney
 
Join Date: Nov 2007
Posts: 10,759
Mein Auto: rescued bmw's
believe it is an emission component in the evap system.


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