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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 02-26-2014, 11:59 AM
FUKJDM FUKJDM is offline
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Mein Auto: 745li
leak diagnostic pump 04 745li?....

Was told by my local indy that i will need to replace my leak diagnostic pump. He kind of showed me where it was located and wanted to charge me 2 hours for labor plus 150 for the pump. Found one on eBay (OEM) for 90 bucks but cant seem to find any history on anyone doing this themselves on the DIY 7 series. If anyone has any input or has done this plus chime in with any tips/suggestions!...THANK YOU!

PART# PER VIN 16137193479

Last edited by FUKJDM; 02-26-2014 at 12:04 PM.
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  #2  
Old 02-26-2014, 04:40 PM
JC 2001 750iL JC 2001 750iL is offline
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Mein Auto: 745Li, 750iL
Its up in the passenger side rear wheel well.
You'll see it when you remove the wheel liner.
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  #3  
Old 02-26-2014, 05:43 PM
Busarider Busarider is offline
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What is a leak diagnostic pump? and why did the mechanic tell you that it has to be changed? did you have any problems?
Please post so we can all learn.
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Old 02-26-2014, 05:57 PM
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mybmw408 mybmw408 is offline
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Mein Auto: BMW 750i
http://parts.bmwofsouthatlanta.com/s...ssembly=420266

Looks like its on the fuel tank


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Last edited by mybmw408; 02-26-2014 at 05:58 PM.
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  #5  
Old 02-26-2014, 10:22 PM
dvanlare dvanlare is online now
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It's mounted to the expansion tank. I replaced mine a few weeks ago. It's not a bad job. I think it took me a little over an hour.

1. Remove the right rear wheel arch trim
2. Remove 2 screws to partially drop the expansion tank
3. Remove 2 hoses connected to leak diagnosis pump (one has a clamp on it)
4. Remove 3 screws holding pump to expansion tank and remove pump
5. Reverse order to install new pump (use a new clamp on the hose)

BTW, this is one of the faults that can cause you to fail the emissions check. It can also be as simple as a leaking gas cap so make sure you check that first.
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Old 02-28-2014, 08:48 AM
Busarider Busarider is offline
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What fault codes does it give you? how do you know that the leak diagnostic pump needs replacing as I don't see any monitoring sensors attached. Just curious.
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Old 02-28-2014, 09:22 AM
FUKJDM FUKJDM is offline
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Quote:
Originally Posted by dvanlare View Post
It's mounted to the expansion tank. I replaced mine a few weeks ago. It's not a bad job. I think it took me a little over an hour.

1. Remove the right rear wheel arch trim
2. Remove 2 screws to partially drop the expansion tank
3. Remove 2 hoses connected to leak diagnosis pump (one has a clamp on it)
4. Remove 3 screws holding pump to expansion tank and remove pump
5. Reverse order to install new pump (use a new clamp on the hose)

BTW, this is one of the faults that can cause you to fail the emissions check. It can also be as simple as a leaking gas cap so make sure you check that first.
Awesome, Thank you! Yup first i changed the cap but the engine light still came back on thats when i took it to the shop and it showed a certain code "leak diag pump" etc...

Quote:
Originally Posted by Busarider View Post
What fault codes does it give you? how do you know that the leak diagnostic pump needs replacing as I don't see any monitoring sensors attached. Just curious.
I dont recall the exact code it was giving but it did cause the check engine light to come on with a emissions related code.
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  #8  
Old 02-24-2015, 01:22 AM
ahokes ahokes is offline
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Mein Auto: 750li
It gives a code of P2402.
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