Thread: D4 Fuel Tank Capacity

Originally Posted by Graeme

D4 petrol and diesel tanks have different part numbers but they might have the same capacity.

Looking at pictures, they look like the same moulding, just different "Dust cover/filter"

Originally Posted by gghaggis

The "usable" value is around 80+ litres. So no, LR are not lying or quoting misleading figures.

To achieve that in a D4 though, you will have to run it completely dry, as you would in any other vehicle. LR try to prevent you doing that by having the fuel cut-off scheme (applied around 80 km after the 0km to empty indication), but it IS possible to drive through that and keep going until the tank is actually empty.

If you're silly enough to do this, you'll likely foul up your injectors and have a bastard of a time priming it to restart, but you'll get your 80 odd litres in.

Your choice.

Cheers

Gordon

Well Gordon, as I have said a few times now, I have run mine until it misfired warning it will stop within a kilometre and it only took 75 litres so something must be wrong or they are not telling the truth.


I did get hold of the member who had his tank replaced under warranty, the top of the tank sunk in completely, which they replaced. If the tanks are plastic and not pressurised while still in the mould cooling they would sink in to varying degrees (I have a good knowledge of roto-moulding plastics). This could be the explanation for the reduced capacity and the variances form one model to the next.


I will be discussing it with them in more depth next week.

Mmm - I got around 40km before the final stop, after surging twice. We got over 80 ltr in, but how much more I don't know.

Fell short of the fuel stop by 4km :-(

Cheers

Gordon

Filled mine up yesterday took 76.7litres.Pump clicked off at 72 litres,then dribbled the rest in.

Dash readout said 17 litres until empty.

I am not brave enough to run the tank down past a quarter as the HPFP requires a lot of bypass fuel for cooling. As the tank gets down the fuel delivered to the HPFP is getting hotter and can eventually damage the pump. It may not show up immediately but will later.
As the car ages there will be some crap in the bottom of the tank which is best left undisturbed. If by necessity I had to go into the reserve I would do a fuel filter change as soon as practicable.
Maybe I am ultra cautious but my training in aviation means there is nowhere up there to pull over to fix beside an airway!

Good point Plane Fixer & wouldn't condensation form in the tank if hot fuel was allowed to cool overnight in a nearly empty tank?

Originally Posted by Plane Fixer

As the car ages there will be some crap in the bottom of the tank which is best left undisturbed. If by necessity I had to go into the reserve I would do a fuel filter change as soon as practicable.
Maybe I am ultra cautious but my training in aviation means there is nowhere up there to pull over to fix beside an airway!

I never quite understood that argument as the fuel pickup is from the bottom of the tank. So any heavy objects are likely to have already settled and could possibly be stirred up during refueling anyway. Sure lighter particles that can float around will be more concentrated as the tank runs down, but if they are floating then there's every chance they will be sucked up anyway


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