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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 07-19-2012, 12:41 PM   #161
Mike.Santos999
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So the elec pump (pass side) drives the siphon pump (driver side) which then transfers fuel to pass side tank and up to the engine? what's the ave lifetime of the siphon pump? should that be a pm item as well.
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Old 07-19-2012, 12:48 PM   #162
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What actually drives the siphon pump is return fuel from fuel pressure regulator. The fuel is actually traveling in a loop from the electric fuel pump, through the pressure regulator and any extra fuel is returned to the drivers side of the fuel tank and then through the siphon pump.

The siphon pump has no moving parts and rarely fails, I know some people have replaced them, however, I think the replacements were misguided due to a soft fail electric pump and/or restricted fuel filter??
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Old 07-19-2012, 12:53 PM   #163
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Old 07-19-2012, 01:26 PM   #164
2003silver330i
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I'm currently having a headache. Good thing the pump decided to quit while the car was still in the garage.
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Old 07-19-2012, 02:39 PM   #165
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^+1, another one bites the dust. Sorry to hear it caught you off guard, hopefully you have 3/4 tank or less fuel in the car.

Make sure you put the sending unit gasket on right side up on the fuel tank lip so you only have to do the job once!

I do not have any hard statistics, but it appears about 30%+ leave you stranded after parking the car. Most of the ones I have replaced the cars were at the owners homes.

I guess I just do not see the ones that fail out of town or on the road as I am not local to address them

Hopefully this thread is helping out a number of members with a cost effective fuel pump source, info on the gasket and sways a few to replace their pump proactively so they do not get stranded.
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 07-19-2012, 03:00 PM   #166
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Just did mine at 100k and 7 years. Now I can forget about it for another 100k and 7 years. That's almost two cooling systems into the future!
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Old 07-19-2012, 07:02 PM   #167
jfoj
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And yet again another failed pump, but luckily is was at home as a no start!

2003 with 140k miles. Again, in my opinion it is more about time than mileage with electric pumps. 9 years or so for this one?

http://forum.e46fanatics.com/showthread.php?t=933685
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Last edited by jfoj; 07-19-2012 at 07:04 PM.
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Old 07-19-2012, 07:19 PM   #168
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Quote:
Originally Posted by E46Mango View Post
Good post. This absolutely needs to be done. Anybody who disagrees, step up. There is no reason not to do this.

There should be a popup that asks a series of questions:

Have you JFOJ'd in the past 60,000 miles?

Have you replaced your entire cooling system in the past 60,000 miles?

Have you replaced your fuel pump, fuel pump relay, and fuel filter in the past 60,000 miles?

Have you replaced your voltage regulator, battery in the past 60,000 miles or five years?

If the person answers 'no,' a big slap machine reaches out of the computer screen and slaps the offensive person in their face. If the person answers 'yes,' proof must be submitted and approved by JFOJ. Then and only then can they deserve to proceed to the forums.

Anything short of doing any of the above and you might as well be wearing a shirt that says "I love to be stranded!" cause that's pretty much what you're wishing for when you don't maintain critical parts of your car.


I havent done any of these THINGGGSS. But the interior is clean and so they get wet
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Old 07-19-2012, 09:38 PM   #169
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A little help, can someone post the part number for the relay, what's the official part number nomenclature on real OEM, been searching with no luck. Thanks.
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Old 07-20-2012, 09:17 AM   #170
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A little help, can someone post the part number for the relay, what's the official part number nomenclature on real OEM, been searching with no luck. Thanks.
Should be #3 here.....

http://www.realoem.com/bmw/showparts...00&hg=61&fg=25
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Old 07-20-2012, 09:44 AM   #171
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Since I've joined this forum (which was only weeks ago), I've found about $1mil worth of PM to do to my car

Appreciate the heads up... I'm just under 60k miles but my car is 10 and half years old so I guess the fuel pump just made my short list (along with the fuel filter, complete cooling system, power steering system, and on and on...)...
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Old 07-22-2012, 11:45 PM   #172
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Just replaced my fuel pump this afternoon and had a question regarding the new pump operation. It seems like after replacement, the new pump is quite a bit louder and can be heard from outside the car when idling. It is considerably louder from outside the car than inside -- so my question is about the lock ring on the pump. I felt like I gave it a good number of smacks with a hammer and screwdriver to tighten the ring, but how likely is it that the gasket is not completely sealed? Would the system lose pressure if it was an issue? Not sure how to diagnose and don't want to crack the plastic pump by over tightening the ring.
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Old 07-22-2012, 11:52 PM   #173
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Mine died on me in rural Australia. Didn't have any choice but to get it towed to a nearby dealership. Apparently there were no e46 m3 fuel pumps in aus (?!) so they had to order one from Germany. Got charged 900 for the pump and 200 for labour! Ouch
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Old 07-22-2012, 11:53 PM   #174
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Once I hit 200,000 miles in my E36 I told myself to do this as preventative maintenance. I kept putting it off. Then it died at 218,000 miles on a Friday night and basically ruined a holiday weekend for me. Just do it!

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Old 07-23-2012, 05:05 AM   #175
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tfoxsf,

As for the pump being louder, it may be due to a new, properly functioning pump? Hard to tell without hearing/comparing to a known good car.

It would be pretty hard to break the sending unit lip tightening the locking ring, but if the sending unit seal was not installed correctly, which happens a lot, it could be an issue.

The 2 biggest mistakes that are made on the sending unit seal are installing it upside down and not installing the seal on the opening lip of the fuel tank.

If you installed the seal upside down, you will likely have a fuel leak when the car is fully filled up and you may also get some Evap codes as well after the car is driven for a while.

If the seal was installed on the sending unit, then dropped in the tank you will also likely have leaks, Evap codes and your fuel level may show incorrectly and it may be possible you run out of fuel a bit quicker as the pump may not be as close to the bottom of the tank.

If you had any problem getting the pump/sender seated in the seal and/or had a hard time getting the locking ring to grab the tank lip, it is likely the seat was not installed on the lip of the tank opening. There is a slit in the side of the seal. If the seal was installed upside down, on the tank lip, you probably had no issue with seating the pump/sending unit or starting the locking ring on the tank.

It is easy to recheck this, just make sure you have less than 3/4 tank of fuel if you want to check and open the tank again.
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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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Old 07-23-2012, 10:39 AM   #176
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Thanks jfoj-

I'll run through and check some of your suggestions when I get home this evening.

I installed the gasket on the tank first and then wiggled it to insure it was fully seated before pressing in the pump. I then pushed the pump down to insure the plastic tab at the rear was flush with the cutout in the gasket. I suppose it is possible that I installed the gasket upside down - however, it had some cutouts/recesses that seemed to line up with the pump.

I'm glad to hear there is some fault code that may be thrown if I was leaking fuel (Evap Code). I was trying to figure out a way to monitor leaking (looking under car after parking?).

Thanks again for the reply.
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Old 07-23-2012, 01:38 PM   #177
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I changed both of mine at dealer prices (for the pump) after being stranded twice.

2003 330Ci @112k died in airport parking so rode a flat bed home from vacation...

2004 330Ci @107k died in my work parking lot
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Old 07-23-2012, 03:21 PM   #178
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Quote:
Originally Posted by tfoxsf View Post
Just replaced my fuel pump this afternoon and had a question regarding the new pump operation. It seems like after replacement, the new pump is quite a bit louder and can be heard from outside the car when idling. It is considerably louder from outside the car than inside -- so my question is about the lock ring on the pump. I felt like I gave it a good number of smacks with a hammer and screwdriver to tighten the ring, but how likely is it that the gasket is not completely sealed? Would the system lose pressure if it was an issue? Not sure how to diagnose and don't want to crack the plastic pump by over tightening the ring.
Even with the gasket installed the wrong way (upside down) and leaking all over the place, the new fuel pump was working silently, so I'd say it has nothing to do with gasket. But by all means it's worth while to recheck it just to make sure. I'd say it's either a defective pump or a coincidence and something else is making the noise.

By the way when installing the gasket just be attentive. There are words "This side goes down" on the gasket for the stupid :-) And do not work in poor light conditions like I did hence the mistake.
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Old 07-23-2012, 06:08 PM   #179
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I wish I had read this before my fuel pump died this weekend and stranded me two hours from home. Now there are a bunch of active fuel pump threads. Weird.
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i heard that this cars go like 300k miles
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Old 07-23-2012, 07:15 PM   #180
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I changed both of mine at dealer prices (for the pump) after being stranded twice.

2003 330Ci @112k died in airport parking so rode a flat bed home from vacation...

2004 330Ci @107k died in my work parking lot
curious at to the weather during the failures? hot and/or summertime?
Quote:
Originally Posted by e4Tsex View Post
Now there are a bunch of active fuel pump threads. Weird.
may have a possible link to the heatwave and summer
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