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Old 11-20-2012, 01:07 PM   #463
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,590
My Ride: 330CiC, M5, X5
Been a long time since I replaced an E46 fuel pump, but on my E39 M5, the pump had to be seated correctly as there was a round pipe with an O-ring that came from the left side siphon pump as I recall?

Is there anything like this on the E46?

Also as for fuel levels, usually once the composite tank level(s) get to about 1/2 tank, the left side of the tank pumps down quickly due to the siphon pump and usually should be empty except due to hard cornering, then the tank pumps down very quickly again.

Use the Hiddern OBC Menu link in my signature to figure out if you are actually transferring fuel from the left side of the tank properly.
Solve your misfires, lean codes, rough idle -

Fuel pump failures -

Temp Info -

Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

E46/E39 GM5 Door Lock Info -

Lower hose temp switch O-ring - BMW #13621743299
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