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Old 07-20-2012, 07:48 PM   #6
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 10,580
My Ride: '06 330CiC, '03 M5
Well with a supercharger fuel pressure/volume is crucial, especially under boost conditions.

Leaning out too much would be a catastrophic event for your engine.

Did the ESS kit include/suggest upgrading the fuel pump anyway?

What is the age of your fuel filter?

Pop the bottom rear seat and see if the soundproofing on the passenger side has ever been cut. If not, your pump is original.

OEM pump is only about $120 from bmaparts.com.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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