running out of fuel

[Ryeman]

Has anybody any experience in running out of fuel in a diesel?


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[GTD_XU1]

I came close three weeks ago, closer than I thought, when I refilled at BP Peak Downs and took 54.51L on the pump, after filling in Chinchilla, I nearly passed out. I think I might have been a litre or two short at Chinchilla. Try not to run out, from what I have read here and 40 years of anecdotal accounts it isn't worth the hassle.

[gldgti]

Has anybody any experience in running out of fuel in a diesel?


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Several times. Usually its not a problem, only if there is some crud in your tank which is more likely (statistically) to be pulled into the pickup if there is very little fuel in there (like gold panning).

Modern diesels (like post 1970's european) typically self prime if the system is otherwise working well so its not normally a problem.

[Ryeman]

I thought the high pressure pump might suffer damage.


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[gldgti]

I thought the high pressure pump might suffer damage.


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It shouldnt run for long enough without fuel to do any damage. Typically a diesel fuel system will stop running once it sucks in a significant amount of air, due to the compressibility. It will continue to pump (if you crank it) but it wont transfer fuel at the rate or pressure required to the engine to run. But there is always fuel remaining in the system to lubricate parts, it just doesnt pump well because the air is compressible.

Once you fill it up again, the pumping action is sufficient to bleed the air from the system but it wont run until such point at which there is enough pressure being generated for the injectors to function properly.

Needless to say, its not a great idea to run it out of fuel, but its certainly not a disaster (unless you are on your way to hospital or running from the bad guys).

[kaanage]

I suspect that if the HPFP was emptied, then it wouldn't develop enough pressure to load the parts that normally require the diesel fuel to lubricate it.

But what does this have to do with fuel economy?

[gldgti]

But what does this have to do with fuel economy?

Not sure :-P

[Ryeman]

In order to know just how far you can go when you get to the bottom of the red ie exactly what is the useable quantity and thus true 'range' knowing the economy.
I have a 'box' on mine which screws up the maxidot L/100KM.


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[Transporter]

I just fill up when the low fuel warning light comes on.
Lets say I just filled up and my average calculated fuel consumption from the fuel docket was 10L/100km and I put 70L in the 80L fuel tank I know that I had 10L in the tank remaining, I could drive another 100km before I would run out of fuel. There is now need to drive until the tank is empty.

[Ryeman]

I simply want the basic ? as to what is the 'useable' quantity?
And
Is it the same as the handbook quoted capacity?
Sometimes I just want to get to my preferred brand.