in truth, this couldn't have been the case. Parked at my dad's on his sloping drive and had 60 miles range. When I restarted the car 3 hours later, it said "distance to empty 1 mile" and nearest fuel was about a mile away, so drove very gently.
Took picture at the fuel pump and put 40 litres in.
Gauge is now showing a smidge under 3/4 full, which should have taken ~ 55 litres by my estimation.
Question is ... does the car go into limp mode or anything when it "thinks" range is zero ?
26th Oct 2023 2:50 pm
SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1146
Yes. It introduces a misfire using the engine software. If this is ignored then it will shut off the engine, allowing you to restart & carry on another couple of miles before doing the same.
The strategy was introduced to stop the high pressure pump from actually running dry of fuel & causing damage.
Which would have been a bit naff as I had about 15 litres in the tank, the car being confused by the slope of the drive I guess?
Wonder if it would have recalculated if I'd stopped on the the flat for a minute?.
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
26th Oct 2023 3:31 pm
Trailered Movements
Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1200
Warm fuel will give a reading higher than cold, so parking up after a days driving with the gauge on, lets say half, in the morning it might show something in between half and a quarter.
Add in the slope, and it can give you quite a shock.
Dave2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago)
26th Oct 2023 4:10 pm
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1064
For what it is worth ........
The fuel gauge in my Disco 4 Commercial MY13 SDV6 has never been correct from day one. They fitted a new sender 6 months from new (I have owned it for 10 years), which did not change it.
If I run it to zero and then fill up the best I can get in is 67 or so litres, noting it is an 85-litre tank.
On more than one occasion I have gone past zero (the needle does not show a negative, just sits at zero). On one journey I was more than 30 miles past zero (looking for fuel late at night) and I have never seen a warning (other than low fuel) or gone into any kind of limp mode!!
Makes you twitch a bit whilst you sit at zero "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
27th Oct 2023 8:22 am
DaveJLBI
Member Since: 07 Mar 2014
Location: Clare
Posts: 682
I thought the tank in the D4 was about 72 / 75 litres? Well, you learn something new everyday. I have never got more than 67 litres in mine either.
27th Oct 2023 8:26 am
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1064
I stand corrected, just checked the manual, 82 litres "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
IFAIK, it doesn't just measure the fuel level directly but blends-in information from the injectors. Each pulse is (supposed to be) a known amount so count the pulses...
2015 Volvo V40
2014 D4 HSE
2006 RRS - C'est mort. Fin... ...It's alive! Oh no, it's not - scrapped.
2019 Suzuki Kingquad 400
2017 RamRod Taskmaster 1150
1977 John Deere 2130
31st Oct 2023 12:28 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20841
If you drive up a hill for long enough, the tank refills? I know it's not considered "kind" to say no these days, but no. Just no, ok? And if it's not ok, still no.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
... All LED interiors lights, DRLs, Spare Wheel protector.
