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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 04-20-2015, 01:23 AM   #1
JayStealth330i
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Starting Trouble

Ok, so I have an e46 330i 2003. I had been driving down the motorway when my car just cut out and lost all power. Took it to BMW who replaced my fuel pump, relay, filter (w/built in regulator), hoses, ccv, cam and crank sensors. Car run fine for a few hundred miles and then died again. Computer said fuel pump, so replaced the fuel pump again but she still won't start! Any ideas what this could be? No other codes other than fuel pump being thrown.

Thanks in advance for your help guys and apologies if posted in wrong place.
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Old 04-20-2015, 06:41 AM   #2
markusmarkus
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Let's rule things out systematically.

1. Codes: did the shop read the computer codes? That always the first step. ALWAYS!
2. Fuel: did the shop check for fuel pressure at the fuel rail on the engine? You're fine if pressure is about 45psi.
3. Electrical: did the shop perform any electrical system tests? That would include an inspection of the battery, a load test of the battery, a check of the alternator output voltages (14.4VDC with the engine running) and an alternator load test (all electrical & electronic circuits on)?
4. Ignition: did the shop check the ignition switch?

I bet you have an electrical problem.
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Old 04-20-2015, 07:16 AM   #3
jfoj
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I am unaware that the E46 has any specific codes/errors for the fuel pump.

I agree that it is likely an electrical problem/connection issue.
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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, 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 04-20-2015, 07:50 AM   #4
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Need more details, be specific. What exactly happens when you turn the key?
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Old 04-21-2015, 11:27 AM   #5
JayStealth330i
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Right it's now at BMW who have said again it's the fuel pump that's causing the back pressure in the system. It's had a new filter and regulator, relay and ccv valve. What else could cause a back pressure in the system enough to blow the hose off the fuel pump? Note: installed is a Bosch fuel pump and not an OEM pump.
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Old 04-21-2015, 11:28 AM   #6
JayStealth330i
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Also how would an electrical problem cause back pressure in the system enough to blow the hose off?
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Old 04-21-2015, 11:33 AM   #7
jfoj
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Hard to diagnose over the Internet, however, the fuel filter needs to be installed correctly so the fuel pressure regulator does its job.

There are a few variations on how the fuel filter and fuel pressure regulator are configured in these cars, but I would think a simple fuel pressure test would answer most of the questions as well as connecting a loose hose to the fuel pressure regulator to see if it is returning fuel back to the fuel tank.

Keep in mind the return line to the tank may be crushed, restricted or plugged.

In order for the fuel pressure to blow off a properly installed hose, I would think you would need 2-4 times the standard system pressure and I am not even sure a standard pump could provide double the baseline system pressure.

When does this hose blow off? While the car is running or while the car is sitting?

This should not be rocket science to figure this problem out. Like I said, a quick fuel pressure test should offer insight to a HIGH fuel pressure problem.
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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, 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

Last edited by jfoj; 04-21-2015 at 11:34 AM.
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Old 04-21-2015, 02:15 PM   #8
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What's the actual pressure they measured?
Is fuel returning to the tank when the return hose is removed?
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E46 NO START - A list of possible causes

"Would the codes indicate if its the carburator?"
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Old 04-23-2015, 12:17 PM   #9
JayStealth330i
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The hose blows off when both driving and sitting stationary with the engine running.
Bmw have told me the fuel pressure at the fuel rail is the correct pressure. They have said that the only thing it can be is the pump but because it's not a BMW pump they can't guarantee that isn't the problem. Anyone know a good BMW mechanic in London England?
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Old 04-23-2015, 12:20 PM   #10
jfoj
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There are NO good mechanics in England!

Might as well look at it yourself.

Either the hose it the wrong size or something else is wrong here.

These hoses should not "blow" off even with close to 200 PSI/13 BAR!
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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, 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 04-23-2015, 06:17 PM   #11
JayStealth330i
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Ok so today I discovered something. The hose only seems to blow off when the heating is on?!
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Old 04-23-2015, 06:43 PM   #12
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Quote:
Originally Posted by JayStealth330i View Post
Ok so today I discovered something. The hose only seems to blow off when the heating is on?!
This is all such bollocks.

You need to start providing USEFUL details as to where and what hose is blowing off. How about some pictures, as they say a picture is worth 1000 words. I would really like to see the clamp that is being used for this fitting as well.

For the life of me I cannot understand how a fuel line is "blowing" off a fitting.

Assuming the hose is the proper size and the flare/barb on the end of the hose or pipe is not missing and the clamp is tight, this SHOULD NOT happen.

This is clearly a major safety and fire problem much less just a major inconvenience.

Is this hose leaking/pumping fuel once it is "blown" off the fitting?

Someone has put the wrong parts on this car and/or used low pressure fuel hose in a high pressure situation.
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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, 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 04-23-2015, 07:28 PM   #13
lszlszx
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Post a picture of the hose.
Dealer seem to be the same everywhere.
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GM No Reverse - posts 427, 439

E46 NO START - A list of possible causes

"Would the codes indicate if its the carburator?"
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Old 04-23-2015, 07:31 PM   #14
jfoj
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Quote:
Originally Posted by lszlszx View Post
Dealer seem to be the same everywhere.
I think we have it much better in the US!
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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, 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 05-05-2015, 01:01 PM   #15
JayStealth330i
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Ok so I had the pump replaced AGAIN, and now the hose seems to be holding, 1500k travelled since pump replaced. Although now it feels like I'm losing some low end grunt! Feels like there is pressure behind the accelerator, like something is blocked up and the fluid struggling to pass through.
Have you guys in the U.S. Heard of a terra clean? It cleans all carbon deposits from the engine/anywhere fuel goes. Just wondered if anyone had actually had this done and if they had any comments?
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Old 05-05-2015, 01:31 PM   #16
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Quote:
Feels like there is pressure behind the accelerator, like something is blocked up and the fluid struggling to pass through.
reset adaptations?
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