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.

Anybody here ?
Thks

"frischmoutt" <frischmoutt.RemoveThis@ici.com> a écrit dans le message de news:
471275d6$0$27378$ba4acef3@news.orange.fr...
> 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.
>
>
>
>
>