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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 12-29-2012, 10:05 PM   #1
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Location: Nevada City
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My Ride: 04 330ci conv.
fuel press. test 04 330ci zhp convertible

Should the fuel pump start running when ig. Switch is full on just before cranking the eng. over?. Also, is the place to test fuel press. that shraeder valve on the injector rail?.
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Old 12-29-2012, 10:19 PM   #2
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Location: Fairfax, VA USA
Posts: 23,237
My Ride: 330CiC, M5, X5, E93
2nd link below in my signature has info you need.
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 12-29-2012, 10:55 PM   #3
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The fuel pump will "prime" the rail when you turn the key to position 2 ("run"). You'll here the fuel hiss through the filter/pressure regulator below the driver's seat.
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Old 12-30-2012, 01:33 AM   #4
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My Ride: 04 330ci conv.
04' 330ci ZHP Convertible no power to fuel pump

A couple days ago the eng. starts missfiring during acceleration. Made it home (barely) sputtering whole way down to a crawl at times. Shut off for 30 seconds would run a bit better afterwards. There is 5v.at one of the fuel pump wires (at fuel pump) at all times. With ign. at run position there is no 12v. at pump. Checkd glove box and E box fuses good. How do i get to relays behind glovebox?,i want to swap wiper and pump relays. Can a bad MAF sensor or what else cause no v. at pump?. Thanks......Robert J. Nc. Ca.
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