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Old 06-27-2012, 09:34 AM   #64
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 10,082
My Ride: '06 330CiC, '03 M5
Not sure about the ZHP, however the M cars may be different??

I have not looked closely at an E46 M car, but my E39 M5 has what looks like a relay, but it is not one. It is called a ETK module or something like that and is all electronic. The pump is PWM controlled from what I understand? Has something to do with fuel delivery at higher RPM under load and the E39 M5 lacks a fuel return from the fuel rail, it returns at the regulator.

It is possible the E46 M cars are similiar?
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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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