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
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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: 1072
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: 685
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: 1072
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.
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31st Oct 2023 12:28 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20844
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.
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... All LED interiors lights, DRLs, Spare Wheel protector.
