E46Fanatics - View Single Post - Replaced both Fuel Level Sensor/Sending Units. DIY with pics....
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Old 03-30-2009, 03:41 PM   #36
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Join Date: Oct 2006
Location: Richardson, TX
Posts: 220
My Ride: 325i
Originally Posted by Jagular View Post
+1. Does the fuel sending unit do the fuel gauging?
The fuel tank has 2 separate chambers with each chamber having its own fuel level sending unit. One of the fuel level senders is part of the fuel pump assembly. Thus when you buy a new fuel pump, a new fuel level sender comes with it. The computer, I believe, takes the average reading to indicate the amount of fuel left in the tank.
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