X5 E70 M57 stalling:fuel pump error

[Chris92]

Greetings!

My E70 3.0D M57 173kw has been acting weird lately.
Whenever my fuel tank goes below 1/2 it will randomly stall. Sometimes after starting up, when driving on low rpm or when cornering in city speed.

I have read online, watched countless hours on youtube.
So far I have done everything that solves the problems for others but mine keeps doing that.
I have done the following things:

*Replaced EKPS unit
*Replaced low pressure fuel pump
*Cleaned the tank and the little mesh filter under the LPFP
*Cleaned the suction jet pump and hoses on the left side of tank
*Replaced the fuel filter
*Checked all the wiring around LPFP

In Autel diagnostics low fuel pressure is 2.5bar when ignition is off and 4 bar when it's on.
In the secret menu of the instrument cluster under test 6.00 I have 30liters on the left side of the tank and 1 to 8 liters on the right one. It's jumping when driving.
What else to look for ? I am totally exhausted. Please help !

[ard]

On my E39, when the jet pump failed, I would run out of gas at ~40%. There was gas in one side but the jet wouldnt pump it across....


Are you sure the jet pump is OK?

[Chris92]

Originally Posted by ard

On my E39, when the jet pump failed, I would run out of gas at ~40%. There was gas in one side but the jet wouldnt pump it across....


Are you sure the jet pump is OK?

Thank you for your reply. When I took out the jet pump I removed it completely from the tank together with 3 hoses it comes with. I cleaned everything there was. Also took my vacuum cleaner and put all 3 hoses in it and created a sealed connection so that if there would be any debris in them it would come out. I can't even think of anything that could go bad on that jet pump. There are no moving parts or anything. Except for some ball bearing and small spring at the bottom of the pump which I also cleaned and put back together. How would it go bad ?

[andrewwynn]

On the e 53 the jet pump fails when a dream opens up and gas comes out the side.

I've rebuilt a few of them. My e 70 isn't as old but i don't know if BMW fixed the m design defect that causes the issue.

Three symptoms almost exactly match jet pump failure.

If on level ground the right side drops below ≈ 1.4L that's the tell.

On the e 53 the transition point is about 27L left it seems far too coincidental that you're at 30. The tanks are different so that might be the transition point.

I can pull up test six and learn what the normal values are for the e 70. I "wow the book" on the e 53 fuel transfer when i fixed both of ours they both failed exactly the same way.

The 53 has a much more lopsided tank with left much bigger.

It also has a deep well for the pump on the right side and holds zero L of fuel on the right after the transition point.

There's a lot for me to learn on the 70 before i can rule with authority but if the transition point of breaking left from right is 30L, odds are nearly 100% jet pump failure.


Sent from my iPhone using Tapatalk Pro

[Chris92]

Originally Posted by andrewwynn

On the e 53 the jet pump fails when a dream opens up and gas comes out the side.

I've rebuilt a few of them. My e 70 isn't as old but i don't know if BMW fixed the m design defect that causes the issue.

Three symptoms almost exactly match jet pump failure.

If on level ground the right side drops below ≈ 1.4L that's the tell.

On the e 53 the transition point is about 27L left it seems far too coincidental that you're at 30. The tanks are different so that might be the transition point.

I can pull up test six and learn what the normal values are for the e 70. I "wow the book" on the e 53 fuel transfer when i fixed both of ours they both failed exactly the same way.

The 53 has a much more lopsided tank with left much bigger.

It also has a deep well for the pump on the right side and holds zero L of fuel on the right after the transition point.

There's a lot for me to learn on the 70 before i can rule with authority but if the transition point of breaking left from right is 30L, odds are nearly 100% jet pump failure.


Sent from my iPhone using Tapatalk Pro

Thank you. Very interesting. What do you mean with this ? ((On the e 53 the jet pump fails when a dream opens up and gas comes out the side.)) ??

[andrewwynn]

Typo: seam.

https://xoutpost.com/bmw-sav-forums/...p-details.html

All the details are there

I was able to pull up my test six today and e 70 works very differently from e 53.

The tank appears to be more like the sedans where both sides are similar in size vs. left being much bigger, also i need to look into it but it seems like no pump well which is definitely a downgrade.


5.4 left 31.6 right. I would say almost for sure you have a transfer pump problem. i’m very close to empty on the left side. I will drive enough today. That should be zero and then I can see if all the fuel stays on the right side after the transition point.

[Chris92]

Originally Posted by andrewwynn

Typo: seam.

https://xoutpost.com/bmw-sav-forums/...p-details.html

All the details are there

I was able to pull up my test six today and e 70 works very differently from e 53.

The tank appears to be more like the sedans where both sides are similar in size vs. left being much bigger, also i need to look into it but it seems like no pump well which is definitely a downgrade.


5.4 left 31.6 right. I would say almost for sure you have a transfer pump problem. i’m very close to empty on the left side. I will drive enough today. That should be zero and then I can see if all the fuel stays on the right side after the transition point.

OMG!! I am sooo dumb. I was thinking that this is how you read the tank. 🫣🫣🫣

[andrewwynn]

Is that your car? 31 L right should be normal but watch the numbers while driving if they don't move you might have a stuck level sender etc.

[Chris92]

Originally Posted by andrewwynn

Is that your car? 31 L right should be normal but watch the numbers while driving if they don't move you might have a stuck level sender etc.

Yes it's my car. The numbers are actually jumping - is that OK ?
I just put in more gas because I have to drive further away tomorrow. I am now seeing this. Does this mean that the siphon jet pump ir working OK ?

[Chris92]

OK this wasn't the problem. We took out all 6 injectors. Took them to the test. 5 were good. 1 was bought new Bosch. New rail pressure sensor. Still no luck. Car starts only with 2-3 attempts.