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View Full Version : DIY - Fuel Gauge Fix (W/Pics)


lsfeder
09-20-2008, 07:43 AM
Hey everyone.
First I want to thank everyone for their input so far with this problem I have been having. I resolved it today, and figured I may as well post a DIY for others to have in case.

This morning I woke up and an idea popped into me head that I should have thought of earlier, access the OBC from the gauge cluster (Test N 06). This test gives you immediate readouts on both floater levels and the total level of fuel. So I entered the test mode after unlocking the computer and walla... floater #2 on the right hand side was reading out a constant 0 even when driving aggressively. (I floored it and braked hard a few times to really get the fuel to slosh around the tank). I knew then that the used floater we had transplanted was also dead.
So off to the stealership I went to buy part # 16 14 6 752 370 (150 dollars )
For those of you who dont know, this floater attaches to the fuel pump of the vehicle (so in effect the power to the fuel pump comes from this floater). So without further ado, I present to you all my first DIY to BimmerFest.

1. Make sure you have protective gloves!! Your hands will be submerged in fuel!! Also, make sure surrounding area has no contamination as it could wind up in your fuel tank and reek havoc on your fuel system!!
2. Unhook rear seat (it pops out if you yank it hard and up)
3. Identify the 2 floater units covered by the plastic protective sheild.
4. I unhooked the right hand side as this was the faulted unit
5. Unplug wiring harness
6. With a flat head screw driver, tap the metal shield in a counter clock wise position to loosen cap.
7. Have a hose plug ready as you will be unplugging a main fuel line from the top of the floater and it WILL SPRAY FUEL!!
8. Loosen mounting screw holding rubber fuel line in place, and squeeze line tightly
9. Remove line and quickly plug it (I used a metal rod)
10. Twist head of the floater counter clockwise till the unit comes loose, then pull up. The rubber gasket needs to be removed as well as the new part comes with a new one.
11. Carefully pull floater out of tank, you may have to yank it a bit to release it (the fuel pump will come off with the unit)
12. Let the fuel from the pump drain back into the tank before moving it out of the car
13. Disconnect the fuel pump from the floater (there are 2 electric wires supplying power to the pump) My floater had so much gunk on it, no wonder it failed.
14. Clip new floater to the fuel pump
15. Install new rubber gasket into the floater gap
16. Install new floater and pump back into the fuel tank (make sure it clicks before proceeding!!)
17. Re attach metal holder and with flat head screw driver and hammer tap clockwise to tighten.
18. Attach wiring harness
19. Wash surrounding area with water and cloth. There will be fuel spilled, so make sure you water it down and clean it off well!
20. Cover unit with plastic shield.
21. Attach seat (plugs back in with a nice thump)
22. I used this opportunity to clean my leather seat with some armor all leather cleaner
23. Enjoy your functioning fuel gauge!

Sticky? I think so
<a href="http://img530.imageshack.us/my.php?image=PIC-19.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/2421/PIC-19.th.jpg" border="0" alt="" /></a><br />
<a href="http://img530.imageshack.us/my.php?image=PIC-0029.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/4227/PIC-0029.th.jpg" border="0" alt="" /></a><br />
<a href="http://img530.imageshack.us/my.php?image=PIC-27.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/7122/PIC-27.th.jpg" border="0" alt="" /></a><br />
<a href="http://img530.imageshack.us/my.php?image=PIC-0028.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/8787/PIC-0028.th.jpg" border="0" alt="" /></a><br />
<a href="http://img530.imageshack.us/my.php?image=PIC-0016.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/9039/PIC-0016.th.jpg" border="0" alt="" /></a><br />
<a href="http://img530.imageshack.us/my.php?image=PIC-24.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/9315/PIC-24.th.jpg" border="0" alt="" /></a><br />
<a href="http://img530.imageshack.us/my.php?image=PIC-0025.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/496/PIC-0025.th.jpg" border="0" alt="" /></a><br />
<a href="http://img530.imageshack.us/my.php?image=PIC-18.jpg" target="_blank"><img src="http://img530.imageshack.us/img530/8538/PIC-18.th.jpg" border="0" alt="" /></a></div></div>

mgad
10-20-2008, 12:09 AM
i have got a problem like that , when i fill my car with gas till the end , the guage only shows half of the tank is filled , i wondered how could this happen , and i didn't know that there is 2 floats , right and left , anyway thnx a lot for precious info ,

do you have a list of the obc tests and what does each test do ??

tice03
01-26-2010, 02:59 PM
Thank you for documenting all that. Is there a place where I can learn how to use the OBC as you described above? I have similar fuel pump issues and I'd love to learn how to initiate and runs tests and stuff.