Member Since: 09 Feb 2014
Location: Truro
Posts: 2407
I am not sure if this will cause the same problem with a D3 as it did on my D4, but when my fuel gauge disappeared after a few hundred miles of driving without it (whilst waiting for the garage to fit me in), it started shutting the engine down.
The car assumes it is running out of fuel so does it to protect itself, you can restart, but you don't always get very far. In fact it cut out before I could even get off the filling station forecourt!Andy
2nd Jun 2017 7:29 pm
mechtrev
Member Since: 04 Mar 2017
Location: N Notts
Posts: 77
don't worry too much as the gauge never reads full for long
2nd Jun 2017 10:41 pm
Arthur-RSA
Member Since: 05 Jun 2017
Location: Cape Town
Posts: 6
Hi TBC15, Fellow Members,
I developed similar problem with Disco3 V8 SE two weeks ago, after my son drove in hilly & sandy conditions.
The problem only showed the next day, when he switched-on!
Having run diagnostics (I think Auto-Logic) it indicated "Fuel Sender 2 Circuit Fault"
RAVE manual of tank details, shows both "Front Fuel Level Sensor" & "Rear Fuel Level Sensor"
The former inside the tank; the latter outside the tank
If not a wiring problem, resolving problem with "Front" requires a tank replacement; whilst problem with "Rear" can be a replacement part. Unsure if latter requires tank to be removed to repair
I believe you are on the right track, given your resistance measurements taken
The Rave Manual gives the following Ω readings for (I must assume) functional Sensors:
Tank /Front Sensor/Rear Sensor
--------------------/----------------/----------------
Empty 51 75.5
Low Level Light 51 120
Half Full 294 280
Full 798 675
Given your reading of ".... circuit 2 has a reported resistance of 1023Ω" versus RAVE manual reading of 675 for a full tank, could be because this circuit is faulty!
DISCO3 Member "Rikc" had 'Empty Gauge" at switch-on, knowing well that there was ample fuel in the tank. This, after having worked on his brakes. His problem was easy to resolve (by Member "ROY_H"), as he had forgot to replace the Fuse for the Electronic Brake; the same Fuse is used for at least for one of the Fuel Sensors; if not both. (The Fuel Gauge will not work if one of the Fuel Sensors is faulty)
Member "Rashaw1968" has the same problem as we have, not knowing what Circuit matches what Fuel Level Sensor
I trust this helps!
If you can provide any advice as to how to go about testing the wiring to the Fuel Sensors, I would appreciate it tremendously, as I would prefer to start there, given that purchasing a Fuel Sensor costs about £90 Pounds here, that translates to some R1,500 in our currency. The refitting cost would likely be more, depending wjhether the Fuel Tank needs to be removed
If you know whether replacement of the rear Fuel Sensor requires the tank to be removed to remove & refit, that would also help a great deal!
Go well!
7th Jun 2017 7:12 pm
Dave T
Member Since: 03 Jul 2009
Location: Glasgow
Posts: 6910
I had erratic readings on my D3, I just replaced the whole tank with one from a scrapped car, very simple fix if the senders are faultyJoined the BMWX5 45e group
1994 Defender 90
2015 RRS Corris Grey/Black roof
2016 D4 Graphite Santorini Black
2012 D4 XS Orkney Grey
2005 D3 S Maya Gold
Convoy for Heroes 2011
7th Jun 2017 7:15 pm
Arthur-RSA
Member Since: 05 Jun 2017
Location: Cape Town
Posts: 6
2006 Disco 3 V8 4.4 - "Fuel Sender/Sensor 2 Faulty"
Hi Folks (Guys & Gals)
I sent the post (below this one) in response to the problem TBC15 had - but so far no-one, including TBC15 - has responded to what sensor showing the fault, is what Tank sensor inside (Front and not replaceable) or Rear (replaceable).
Surely someone out there knows what-is-what!
Also, how simple or complex is it to test the wiring to the Fuel Tank to check if it is not perhaps just a wiring problem?
It may not be just a matter of testing for power, as apart from a Ground Wire - that connects to both "Fuel Gauge Sender Unit A" & "Fuel Gauge Sender Unit B"; the "A" Unit notes "Active", while the "B" Unit notes "Passive".
Trust to hear from someone soon!
Go Well!
Arthur-RSA
++++++++++++++
Hi TBC15, Fellow Members,
I developed similar problem with Disco3 V8 SE two weeks ago, after my son drove in hilly & sandy conditions.
The problem only showed the next day, when he switched-on!
Having run diagnostics (I think Auto-Logic) it indicated "Fuel Sender 2 Circuit Fault"
RAVE manual of tank details, shows both "Front Fuel Level Sensor" & "Rear Fuel Level Sensor"
The former inside the tank; the latter outside the tank
If not a wiring problem, resolving problem with "Front" requires a tank replacement; whilst problem with "Rear" can be a replacement part. Unsure if latter requires tank to be removed to repair
I believe you are on the right track, given your resistance measurements taken
The Rave Manual gives the following Ω readings for (I must assume) functional Sensors:
Tank /Front Sensor/Rear Sensor
--------------------/----------------/----------------
Empty 51 75.5
Low Level Light 51 120
Half Full 294 280
Full 798 675
Given your reading of ".... circuit 2 has a reported resistance of 1023Ω" versus RAVE manual reading of 675 for a full tank, could be because this circuit is faulty!
DISCO3 Member "Rikc" had 'Empty Gauge" at switch-on, knowing well that there was ample fuel in the tank. This, after having worked on his brakes. His problem was easy to resolve (by Member "ROY_H"), as he had forgot to replace the Fuse for the Electronic Brake; the same Fuse is used for at least for one of the Fuel Sensors; if not both. (The Fuel Gauge will not work if one of the Fuel Sensors is faulty)
Member "Rashaw1968" has the same problem as we have, not knowing what Circuit matches what Fuel Level Sensor
I trust this helps!
If you can provide any advice as to how to go about testing the wiring to the Fuel Sensors, I would appreciate it tremendously, as I would prefer to start there, given that purchasing a Fuel Sensor costs about £90 Pounds here, that translates to some R1,500 in our currency. The refitting cost would likely be more, depending wjhether the Fuel Tank needs to be removed
If you know whether replacement of the rear Fuel Sensor requires the tank to be removed to remove & refit, that would also help a great deal!
Go well!
12th Jun 2017 5:06 pm
Dave T
Member Since: 03 Jul 2009
Location: Glasgow
Posts: 6910
to replace sensors you have to remove the tank, is there not a scrapped car around somewhere, its easier to change the whole tank than mess about with a sensor?Joined the BMWX5 45e group
1994 Defender 90
2015 RRS Corris Grey/Black roof
2016 D4 Graphite Santorini Black
2012 D4 XS Orkney Grey
2005 D3 S Maya Gold
Convoy for Heroes 2011
13th Jun 2017 5:49 am
Arthur-RSA
Member Since: 05 Jun 2017
Location: Cape Town
Posts: 6
2006 Disco 3 V8 4.4 - "Fuel Sender/Sensor 2 Faulty"
Hi Dave T,
Thanks for the advice to rather replace Fuel Tank, than remove/replace tank to replace faulty Fuel Tank Sensors.
I will go this route, but just want to check wiring first, to exclude a possible wiring fault BEFORE REPLACING THE TANK- HENCE WOULD APPRECIATE ADVICE HOW TO TEST THE WIRING FOR THE TANK!
Dear all,
I also had the dreaded " B1A76 FUEL SENDER 2 CIRCUIT " fault in my V8 D3. and would be very grateful if you could shed some light on:
-Is it the front or rear sensor?
-If it's the front (I've got skinny arms, can I reach the front sensor dispensing with the costly tank replacement opiton?
-The front sensor is held in place by a kind of "pull strap" plus 2 locating pegs, hope to be able to refit in the right place (after all, somebody manages to squeeze that in the tank in the manufacturing process)
-HAs anybody taken this sensors apart to see what and where is the fault? I mean
-corrosion in the inner tank harness
-resistors dead (difficult, but could be, in theory this is kind of "magnetic-duh-duh-something which prevents wear from old-style sliding tracks)
-Or just the cheapo plastic float which becomes porous and sinks?
(I recall, even being off topic, the "low coolant warning" caused by a chepo float which became porous and sank)
I will perform a post mortem autopsy, but will have to wait some months. And will be exchanging both sensors, just in case, as it's not the prettiest job to do
Best regards
RobertRegards, Robert
Only a closed filling station can prevent me from reaching my destination
1992 Santana 88"SWB petrol
1995 RRClassic 300Tdi
1999 D2 V8 manual coiler
2004 D2 Td5... SOLD!
2006 D3 V8 SE
11th Sep 2017 9:38 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1822
When mine failed I removed the tank and opened it up - there was a broken wire to the rear sensor which I soldered back together and some heat shrink - all was okay. Make sure when putting the tank back in that you connect all hoses up correctly otherwise they leak. On mine, sensor 1 was front and sensor 2 was rear both inside the tank.
Thank you so much, being then 2 the rear one seems it will be easier to sort out
Best regardsRegards, Robert
Only a closed filling station can prevent me from reaching my destination
1992 Santana 88"SWB petrol
1995 RRClassic 300Tdi
1999 D2 V8 manual coiler
2004 D2 Td5... SOLD!
2006 D3 V8 SE
5th Oct 2017 6:57 am
Arthur-RSA
Member Since: 05 Jun 2017
Location: Cape Town
Posts: 6
Fuel Gauge Problem - Disco 3
Hi Robert,
I refer to your post:
"Thank you so much, being then 2 the rear one seems it will be easier to sort out
Best regards"
I am registered as Arthur-RSA and posted the same problem I experienced a few months ago!
In my case, the Auto-Logic Diagnostics indicated along the following:
...Fuel Sender 2 Fault
...Fuel Sender 2 Circuit Fault
I was also told that Sender 2 was the REAR Sensor & went and bought this sensor.
When the Disco3 went in for repair, they told me that it was the FRONT Sensor!
This sensor can only be replaced by someone with long, thin arms (due to the location inside the tank of this sensor)
Immediately, after the repair was done and the Fuel Gauge light no longer showed empty, the car slowed-down quite dramatically, when "under load " - either when trying to accelerate when going uphill or when towing a trailer.
The pump-component of the Pump Housing was now proven faulty as the Diagnostics showed "Running Lean". This problem "under load" was not prevalent before the repair, as I had used the vehicle under those "under load"conditions, for some 4-months, before deciding to rather fix the Fuel Gauge problem, being the eventually, diagnosed "Front Sensor".
Our guys have done a number of "Front Sensor" replacements, without having to replace the tank, as indicated on the Disco3 Forum posts!
Trust this will help
Go Well!
Arthur-RSA
15th Oct 2017 8:36 pm
bqproduction
Member Since: 05 Mar 2018
Location: gauteng
Posts: 1
hi
my discovery 3 fuel gauge shows empty but is full, what can be the problem
5th Mar 2018 8:41 am
Arthur-RSA
Member Since: 05 Jun 2017
Location: Cape Town
Posts: 6
Fuel Gauge Problem - Disco 3
Hi,
Refer the Reply that follows, being what I posted June 2017.
Thanks & good luck, Arthur
p.s. My problem was resolved by L&R Service Centre Milnerton Tel 021-552-1979
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