Z3 Coupé 3.0i fuel gauge & DTE issues

I know that I must not insist filling the tank when it's full. Unfortunately for some reason the gas pump wasn't working correctly and I did it again.
I already had issues around 50000 km with erroneous values on the DTE only, however the fuel gauge was OK. The DTE recovered by itself after I filled up 4 or 5 times.
Last week, the DTE began to display "- - - " while the fuel gauge was a little bit below the middle. I stopped in a gas station, added around 25 liters (correlating the covered distance) and started with the DTE still displaying "- - -" as well as a gauge pointing to the same figure as before. It normally continued to decrease down to zero then the light went on for the rest of the journey. I made 1900 km stopping every 450 km.
Now comes the troubleshooting preceeding the dismantling: Should the connections be bad, I assume that the gauge would display non-consistant values or zero if the contact is open. This is not the case, at least not abruptly. The fact that it immediately continued to decrease normally is quite puzzling but it may depend on the transducer design. I don't know how it's built and this is one of the purposes of this message. Assuming that this is something like a potentiometer actuated by a float, it might be blocked by some particles avoiding any further upwards motion. In this case it should have been stuck at the same value as before until the level of fuel was low enough. _ It was decreasing although the tank was full _and did not recover further on. May a specialist detail the design of this stuff ?
Second, the DTE was displaying a still "- - -". Normally when the fuel level is very low, with a DTE less than 15 km, the "- - - " are blinking. Two transducers might provide an explanation. Same question as above.
Are there any software known issues ?
Third, the carpet is cut behind the passenger seat following a dotted line. This is to provide access to the fuel pump. Does this cut also provide an access to the transducer (s) ? Are there any precautions to take for the cutting (wires below, tubes, ...) ?
Anticipated thanks for the help.
Add pictures here
✖
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Anybody here ? Thks

Unfortunately
only,
up
before.
case,
is
low
further
level
line.
Add pictures here
✖
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I have an '03 Z4 that is doing the same thing. The local dealer replaced the fuel tank but the problem is worse now than it was before.
Have you had any luck figuring out what is wrong or what part(s) failed?
Thanks! Ed
On Sun, 14 Oct 2007 22:06:33 +0200, "frischmoutt"

Add pictures here
✖
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.