Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Arnott
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #41  
Old 12-05-2017, 06:46 PM
Member
 
Join Date: Dec 2017
Location: Europe/Slovakia
Posts: 5
BlackMW is on a distinguished road
didn't check DTE, just fuel gauge (was referring to OBC by mistake, I ment instrument cluster, I have no OBC)
Filter with regulator is new, I replaced it five days ago.
The first time I was running the fuel pump dry, long cranks started (20-30 seconds),
I replaced the fuel pump and long cranks disappeared instantly,
so must have been definitely caused by fuel pump.
Now the longer cranks started after running the pump dry again.
I'm pretty sure siphon is the cause, pump is the consequence.
Still trying to fix the cause - 30 litres in left tank, 8 litres in right tank.
With a working siphon this should never happen.
Will report after new pump. Everything will be new or fixed after the pump, well except for the siphon itself :|
Reply With Quote

Sponsored Links

  #42  
Old 12-05-2017, 07:26 PM
semcoinc's Avatar
Member
 
Join Date: Dec 2014
Location: Dallas, TX
Posts: 833
semcoinc is on a distinguished road
Quote:
Originally Posted by andrewwynn View Post
Tank has approximately 93L capacity. You are seeing about a 10L error if you see 82L full.


Sent from my iPhone using Tapatalk Pro
When the IBUS app was reading in gallons it showed 22 gallons and my gauge was pegged on full.

As with all other info the IBUS app accesses, it must be coming from the OBC. I have not run a Test 6 check on the IBUS app to see if they both read the same. Maybe will do that when I get a chance and see what Test 6 says and compare to IBUS app.

Interesting difference.

I have not yet run the IBUS app on a long trip where I run the fuel down near empty.

Mike
__________________

Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i Pearl Beige
2003 E46 330Xi Monaco Blue
2007 E90 335Xi Black Sapphire Metallic
2011 F25 X3 28i Black Sapphire Metallic
Reply With Quote
  #43  
Old 12-05-2017, 08:06 PM
Member
 
Join Date: Sep 2017
Location: Geneva, Switzerland
Posts: 322
scourtaud23 is on a distinguished road
So as I was bored and not tired (its midnight in geneva), I decided to go fill up. I started the car in reserve (light on) (wasn't on when I parked a few days ago and quickly turned off).

Values before startup : 7.4/ 2.3 / 9.7L
Values after 7km arrived at the pump : 3.4/ 7.4 /10.9L (light off)

I went and filled up the car (driving a bit to let it warm up fully (the oil is soo long to get to temp) at the pump I insisted after the first click, got a few more liters in (total 67.14L according to the pump).

Values after fill up : 53.9/ 26.6 /80.6L

the fuel gage has never been this close to the top, its barely before the 1/1 mark. I'll definitely check the sender unit on the pump side as soon as I can but tomorrow I'll take (using daylight) a ohm reading from the senders so I can compare to bench values.
Reply With Quote
  #44  
Old 12-05-2017, 09:04 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 8,186
andrewwynn will become famous soon enough
I have frequently filled up with 90L (23.5g). The light turns on with 8L if you have 6cyl and 10L if you have 8 cyl.

The gauge will go *past* 1/1 when full. You are definitely not getting proper readings.

It's not great to do pump repairs when tank is full but with caution you should be able to pull it off.

Run the car with the right tank unplugged to depressurize the fuel line before disconnecting.

I read a TSB today that BMW improved the spring tension on the wiper on the sending unit resistor you may be able to retrofit with a stiffer spring and repair the malfunctioning unit.


Sent from my iPhone using Tapatalk Pro
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #45  
Old 12-06-2017, 03:48 AM
Member
 
Join Date: Sep 2017
Location: Geneva, Switzerland
Posts: 322
scourtaud23 is on a distinguished road
Of course I will depressurise the system before doing anything. and work outside whenever fuel is openly involved.

I did fill up because I wanted to be able to see the Ohm resistance between full tank and bench full and I can't think of another way to test that.

Beyond the fact I might get a bit more fuel on my gloves (made for that), since the tank was never going to be dry, the precautions are the same and the risks the same.

And I'm not really going to be making any repais, just testing. I'll report back later on my findings.
Reply With Quote
  #46  
Old 12-06-2017, 04:09 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 8,186
andrewwynn will become famous soon enough
e53 Fuel Supply Detailed (fuel pump / siphon pump diagnostic help)

You may be able to Repair. Clean the resistance bar and add some spring pressure to the wiper and you'll likely fix it.

Having just done 4 or 5 fuel pump swaps, her is a very helpful tip: a bucket to collect lots of paper towel to soak up any gas. Once you are done use a fire pit or grill etc to dispose by fire. No safer way to get rid of a gas soaked rag than controlled burn. We have a fire pit with a screen over the top that works perfectly.


I want to add: I'm thrilled to see people being able to take advantage of the unbendable l unbelievable pain in the ass it took to research and put into words this thread. Especially that somebody already resurrected a siphon pump head (seam with no seal: moron move BMW!). Awesome!
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)

Last edited by andrewwynn; 12-06-2017 at 04:15 AM.
Reply With Quote
  #47  
Old 12-06-2017, 12:09 PM
Member
 
Join Date: Sep 2017
Location: Geneva, Switzerland
Posts: 322
scourtaud23 is on a distinguished road
Quote:
Originally Posted by andrewwynn View Post
You may be able to Repair. Clean the resistance bar and add some spring pressure to the wiper and you'll likely fix it.

Having just done 4 or 5 fuel pump swaps, her is a very helpful tip: a bucket to collect lots of paper towel to soak up any gas. Once you are done use a fire pit or grill etc to dispose by fire. No safer way to get rid of a gas soaked rag than controlled burn. We have a fire pit with a screen over the top that works perfectly.


I want to add: I'm thrilled to see people being able to take advantage of the unbendable l unbelievable pain in the ass it took to research and put into words this thread. Especially that somebody already resurrected a siphon pump head (seam with no seal: moron move BMW!). Awesome!
So I played with the pump this afternoon, bottom line : I failed.

Some details hoping it'll give you some ideas. First I Ohm tested the gauge in place : 443Ohms

Then I took it out and bench tested it : 0Ohms at empty and 500Ohms pinned to the top. But not completely. Pinned to the top, it showed a few readings above 460Ohms before getting to 500 and staying there. I could not detect any dead spots along the scale.

I'm not quite sure what to make of this but I think there might be a new sender or at least a new plate (if it can be found) in my future. Do you know if its the same plate as the other side (cheaper assembly, I could swap the plates).

It apears its not the original pump since there is a DIY variety screw clamp on the pump hose (inside the tank).

Looking inside the tank I saw some kind of "holder" where I thought the pump assembly might be held but it seems bent and is scratched (see photos).

Out of curiosity, what should test No6 say when the tank is full?



Reply With Quote
  #48  
Old 12-07-2017, 01:01 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 8,186
andrewwynn will become famous soon enough
e53 Fuel Supply Detailed (fuel pump / siphon pump diagnostic help)

So clearly the pump was diy replaced. I would replace the entire pump assembly I bought for $120 amazon with a 1 yr warranty. Topscope or similar. Now caveat : I actually had to take advantage of the warranty after 10 months but they sent me a new pump I only had to send a photo of the date stamp so take a pic of that when installing and you won't have to remove the pump should it fail.

The pic down into the right tank shows the pressure relief and ONE siphon outlet but there should be TWO. See the diagrams showing the system. I don't know if I have photo looking in but something is amiss there.



This is what you should see in the right tank. If one of the siphon outlets is looped back to the left tank you will have the symptom of weak pump.

Sent from my iPhone using Tapatalk Pro
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)

Last edited by andrewwynn; 12-07-2017 at 01:08 AM.
Reply With Quote
  #49  
Old 12-07-2017, 01:14 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 8,186
andrewwynn will become famous soon enough
e53 Fuel Supply Detailed (fuel pump / siphon pump diagnostic help)

443 Ω out of 500 that's about 90%. That makes sense related to your gauges. This would happen if the sweep arm is bent or the pump installed crooked.

That little dish that appears to be bent is likely your problem. It is what holds the pump body in the correct position. Notice there is a "pecker" on the port side of the pump that peg leg goes into that cup. Your cup is curled/bent and would make that difficult. Not sure if you can get just that part but if you can pull it off and straighten and re install it will help you get the pump installed straight.


Sent from my iPhone using Tapatalk Pro
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)

Last edited by andrewwynn; 12-07-2017 at 01:22 AM.
Reply With Quote
  #50  
Old 12-07-2017, 01:21 AM
Member
 
Join Date: Sep 2017
Location: Geneva, Switzerland
Posts: 322
scourtaud23 is on a distinguished road
I do think I'm going to replace the whole assembly enventually but I'd still like to vind out why I'm not getting a correct fuel reading as on the bench it works. I will also have to find the correct assembly (with additional heater)

My best guess right now is that the spring loaded part is not seating deep enough in the tank. Is the prong on the sender side of the assembly supposed to be in the siphon pump or next to it or not in contact?

I believe the second tube is pressing against the top of the tank, I'm not quite sure to its coming out again to check While it'll be out, I'm thinking of looking you I can separate the bottom part from the top part (the circle that closes the tank) of the assembly so I can see how the bottom part seats in the tank and maybe find the issue.

The diagram is not that clear and pictures don't help, is there supposed to be somethng plugged or attached to the pump inside the tank?
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 08:02 PM.
vBulletin, Copyright 2021, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.