Front Runner 45l aux fuel tank real capacity

[patclan]

Hi all,

I am looking for a bit of info from others that may have the 45l front runner rear wheel arch fuel tank in a Puma.

I have never been able to get more than 110 lt in any one fill into the tanks, I would expect on empty to be able to fit 120 lt total.

I have run it as low as I feel comfortable, I carry a jerry can with fuel for when it does the running out of fuel stop start process, but I have never been able to get there, I keep bottling it and filling up, I have had the needle way past empty it has to be running on fumes, yet when I fill it up it based on tank capacity I should have another 10 litres.

So has anyone with this tank actual run it dry and if so what did it take to fill it? One day I might be able to find out but getting to the emergency fuel stop start process makes me nervous.

cheers
Pat

[Hoges]

Do you have any stats on the notional vs useable capacity? Most fuel tanks are rated on their theoretical or notional volume. Because of their (often) irregular shape, their practical or "useable" volume can be 90% or less of this total, especially when auxillary tanks are added... so "empty" ain't necessarily "really" empty!
cheers

[Summiitt]

Yep, I've got 120 litres into mine but it hadn't run out of fuel! It also takes a while to fill the last 5-8 litres...

[chook73]

At 120lt you would have no fuel at all left. The puma goes into limp mode with 5lt left from memory and it shows empty with about 8lt left.

The most I have ever got in there is 113lt which is pretty close to the 5lt remaining. I also find it your desperate for every last drop to get in give the car a good shake whilst filling the last bit and you will get Another liter or so in.


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[patclan]

At 120lt you would have no fuel at all left. The puma goes into limp mode with 5lt left from memory and it shows empty with about 8lt left.

The most I have ever got in there is 113lt which is pretty close to the 5lt remaining. I also find it your desperate for every last drop to get in give the car a good shake whilst filling the last bit and you will get Another liter or so in.


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see that's where I am confused, I thought it was an 80lt tank with 75 usable and the 5lt for limp mode, hence the 120 litre of usable fuel, but if that is the case then that makes some sense why I can,t get 120l in it, but the if Summiitt has managed to get 120 in then I now feel ripped off ;-)

[chook73]

see that's where I am confused, I thought it was an 80lt tank with 75 usable and the 5lt for limp mode, hence the 120 litre of usable fuel, but if that is the case then that makes some sense why I can,t get 120l in it, but the if Summiitt has managed to get 120 in then I now feel ripped off ;-)

This is from the workshop manual which states the fuel tank capacity in a 110 puma at 70lt ;) I dont have my normal manual with me so I cant check that. This would give you 115 useable litres which would explain why I have got 113 in there at the most.

LOW FUEL INDICATION AND RUN DRY STRATEGY

The run-dry strategy is used to maintain the systems fuel prime at fuel run out. It ensures the minimum amount of fuel is always left in the swirl pot.

The instrument cluster activates the yellow low fuel warning light, (next to the fuel gauge) with 15% of fuel remaining in the tank. The fuel gauge will indicate empty with 11% of fuel left in the tank.

With 4 liters left in the tank the run-dry strategy will be invoked. An engine mis-fire will be induced for approximately 1 mile after which the engine will be shut down. The engine can be re-started in mis-fire mode and will continue to run for a further mile until the engine shuts down again. This can be repeated until the fuel suction port in the tank is uncovered and causes engine fuel starvation and loss of prime. Re-starts after run-dry shut down are not
recommended.