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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 03-01-2017, 09:48 AM   #1
tritron
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Fuel pump

I wonder if anyone had installed new pump instead of full siemens vdo fuel pump.
Ebay has tons of choices on fuel pump parts doe anyone ever install it and has any recomendations.

Last edited by tritron; 03-01-2017 at 10:00 AM.
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Old 03-01-2017, 09:51 AM   #2
cvx5832
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Quote:
Originally Posted by tritron View Post
I wonder if anyone had installed new pump instead of full siemens vdo fuel pump.
Is there pump that can be purchased.
Search. Some here have done it. And no most don't recommend it. The full pump is cheap enough.
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Old 03-01-2017, 09:56 AM   #3
jmo69
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There is a Bosch pump, but it's not worth the hassle to change it. $120 for the pump and $155 for the whole unit. https://www.fcpeuro.com/products/bmw...em-16146766942
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Old 03-01-2017, 09:57 AM   #4
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The fuel pump is a PITA to remove from the sending unit and even if you can get the old one out, the replacement may not have the correct wiring, pick up sock and so forth.

When the sender/pump can be changed in as little as 15-30 minutes if you are good, you will spend 30-45 minutes just trying to replace the pump on the sending unit if you do not cut or break anything.

Not an advisable way to go IMHO.
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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 03-01-2017, 04:14 PM   #5
CalVol
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Recently, I bought a Bosch from RockAuto for $120. Keeping it in the trunk as a hot replacement in case my original fails.
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Old 03-01-2017, 07:26 PM   #6
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Make sure you have a small worm drive hose clamp to go along with the pump and the tools to do the job.

More often than not the pump will fail when you shut the car off and it will not start, but sometimes they will go soft and cause driveability problems before they hard fail.

They seem to like to hard fail when it is below freezing outside!!
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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 03-01-2017, 07:36 PM   #7
CalVol
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Thanks jfoj, didn't think of that one (hose clamp), will put in my roadside emergency toolkit... I did get two 6mm screws to use to push the old pump off the block (two threaded holes on the pump), figuring it would be hard to get off since it's the original pump... my experience with soft fail FP's is exactly that-- on restart after running a while they will fail, because the worn bearings freeze up when hot-- the remedy is to hit the FP with a hammer a couple of times (not an option here)-- did this with my old MkII Jetta a few times until it was replaced.

Last edited by CalVol; 03-01-2017 at 07:39 PM.
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Old 03-01-2017, 07:42 PM   #8
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Did you buy the pump or the pump/sending unit assembly??

The Siemens/VDO pump/sending unit assembly is only about $147 from www.bmaparts.com

I can change a pump/sending unit assembly in 15 minutes from opening the door to starting the car with the rear seat bottom reinstalled.
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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 03-01-2017, 07:53 PM   #9
CalVol
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Yes, I have the whole assembly-- I wanted to rebuild the original one, but it was not cost-effective given the options for replacement pumps, which were about $110, and not either Bosch or Siemens-- so I just went with the total assembly from the cheapest option I could find ($120-Bosch-RockAuto)... I recently rebuilt a Toyota FP and it saved about $60 using the original assembly and a OE Denso replacement. Looks like Bosch and Siemens don't even bother providing naked pumps-- probably most dealers/mechanics don't want to bother rebuilding one. I could replace it, but I'm curious to see how long the original will last and can easily replace it in a parking lot or something if I have to....
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Old 03-01-2017, 08:20 PM   #10
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You can sleeve a Walbro 255 to fit.

With that said, if you have the full assembly it's a easy swap. I did mine a few nights ago, along with the M3 fuel pump baffle at the same time. Half an hour. 10mm socket, dikes to cut the stock clamp, 6mm socket for the new hose clamp, hammer, and long handle screwdriver to remove the plug / drift to pull the pump cap.
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Old 03-01-2017, 08:39 PM   #11
CalVol
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Thanks Chibo, I'll put a Walbro in my original assembly when it fails, so I'll have a backup to my Bosch... + add those tools to my REK.

Last edited by CalVol; 03-02-2017 at 12:08 AM.
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Old 03-01-2017, 09:11 PM   #12
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Yes, just keep in mind that it does need to be sleeved. Not a straight drop-in.
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Old 03-02-2017, 12:06 AM   #13
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I accidentally bought a Üro parts fuel pump from rockauto when I meant to get the Bosch and installed it temporarily because mine had completely failed.
Well life takes hold and I never got around to changing it out and that was 4 years ago. Haven't had a single issue.

Only thing was at install I had to remove the floater arm from the OEM pump and attach it to the new pump. I was having issues with the fuel gauge and that fixed everything.


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Old 03-02-2017, 12:08 AM   #14
Chibo
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As a datapoint, the pump that I pulled out of my car was the stock one. 179k miles on the car, intermittently lost pressure whilst sitting over night. The Bosch I put back in is significantly louder than the stock pump, you can hear it whine at idle outside the car.
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Old 03-02-2017, 12:16 AM   #15
jfoj
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Quote:
Originally Posted by Chibo View Post
As a datapoint, the pump that I pulled out of my car was the stock one. 179k miles on the car, intermittently lost pressure whilst sitting over night. The Bosch I put back in is significantly louder than the stock pump, you can hear it whine at idle outside the car.
Your pump had soft failed as well as the check valve was probably leaking.

http://forum.e46fanatics.com/showthread.php?t=929501
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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 03-02-2017, 04:14 PM   #16
tritron
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What you guys thinnk about delphie fuel pump.
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Old 03-02-2017, 04:21 PM   #17
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Siemens VDO is the way to go here. Buy from FCP Euro to get that lifetime warranty.
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Old 03-02-2017, 04:32 PM   #18
jfoj
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Cheap fuel pumps die and then you walk.

For the $150 a Siemens/VDO you will not be walking for another 8-12 years!

A fuel pump relay is not a bad idea to replace as well, they have not been failing, but I expect as these cars get toward 20 years old, relays are on limited time.

But luckily our cars have a spare relay onboard, the horn relay might have had 100 cycles less or in 15 years, just swap the 2 relays in a bind.
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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 03-07-2017, 09:10 AM   #19
io14
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Thanks jfoj for your information over the years. I have a 05 325xi with 67K on it and when I return home will probably take out the rear seat and change the fuel pump. I've always done PM on this vehicle and in the long run it pays off vs get stranded in " No Man's Land ".
Thanks again!

Last edited by io14; 03-07-2017 at 10:11 AM. Reason: mispell
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Old 03-07-2017, 03:45 PM   #20
All2kool
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Silly question - I ordered a new Fuel Pump and it arrived today. On the float, there is a plastic wrapping - this needs to be removed yes?
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