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Fuel Tank Size And Mpg


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#1 gh1

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Posted 16 February 2012 - 09:33 PM

i have bought a 1.4 tdci edge 2009 version of the fiesta - nice car but i'm a little confused. every where says it has a 45 litre tank but each time i fill it i only get 35 litres in and it's full to the brim (from red line + light on).

only get 400 miles aswell from full tank - what do other people average? can't get anywhere near the combined mpg figures quoted - could this indicate a problem?

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#2 rojariggs

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Posted 16 February 2012 - 09:47 PM

It's only about 40 llitres in the diesel. Do you fill up as soon as the light comes on? To get 40 litres in you would have to be brave and get the needle right down to the very bottom! I run right down to the bottom with the range on 0 and I only get about 38 litres in.

400 miles from 35 litres is a bit low but not scary bad. What sort of driving do you typically do? You won't get the mfg figures but should be getting a bit more than that unless it's all ony round town on a cold engine.

#3 iNath

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Posted 16 February 2012 - 09:59 PM

As above, 40l tank on the diesel (42l petrol) the probably a little reserve too.
I've driven it down to 0 miles and still only got 38l in.

#4 gh1

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Posted 16 February 2012 - 10:01 PM

probably done 6-7miles after the light came on. mainly dual carriage - bit of stop start but generally steady at 50-60 mph. only had it a couple of weeks so will check again. if the tank size isn't 45 litres why say it is? 35 litres is about 8 gallons so averaging approx 50 mpg - thought i would get closer to 60 the type of driving.

#5 iNath

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Posted 16 February 2012 - 10:17 PM

if the tank size isn't 45 litres why say it is?

Where does it say it's 45l?

#6 gh1

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Posted 16 February 2012 - 10:22 PM

on the spec when i bought it

#7 iNath

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Posted 16 February 2012 - 10:34 PM

Sounds like dealer error then.

#8 rojariggs

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Posted 16 February 2012 - 11:10 PM

I think the mk6 was 45 litres?

If you only do 6-7 miles when the light comes on you've still got a good 5 litres or so in the tank. The light comes on with about a gallon (4.54 litres) left.

#9 orcomma

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Posted 17 February 2012 - 10:49 AM

MY09 is mk7, 40L diesel, 42L petrol according to handbook (page 136 of the second revision of the handbook, not sure in rev 1):

Capacities
Variant Item Capacityinlitres(gallons)
Windscreen and rear 2.5 (0.6)
All window washer system
Vehicles with a petrol Engine cooling system approx. 5.5 (1.2)
engine
Vehicles with a diesel Engine cooling system approx. 6.1 (1.3)
engine
Vehicles with a petrol Fuel tank 42 (9.2)
engine
135
Maintenance
Variant Item Capacityinlitres(gallons)
Vehicles with a diesel Fuel tank 40 (8.8)
engine
Engine lubrication system- 3.8 (0.8)
including the oil filter
1.25L Duratec-16V
(Sigma)/1.4L Duratec-16V
(Sigma)
Engine lubrication system- 3.5 (0.8)
excluding the oil filter
1.25L Duratec-16V
(Sigma)/1.4L Duratec-16V
(Sigma)
Engine lubrication system- 4 (0.9)
including the oil filter
1.6L Duratec-16V Ti-VCT
(Sigma)
Engine lubrication system- 3.8 (0.8)
excluding the oil filter
1.6L Duratec-16V Ti-VCT
(Sigma)
Engine lubrication system- 3.8 (0.8)
including the oil filter
1.4L Duratorq-TDCi (DV)
Diesel
Engine lubrication system- 3.4 (0.7)
excluding the oil filter
1.4L Duratorq-TDCi (DV)
Diesel
Engine lubrication system- 3.9 (0.9)
including the oil filter
1.6L Duratorq-TDCi (DV)
Diesel
Engine lubrication system- 3.5 (0.8)
excluding the oil filter
1.6L Duratorq-TDCi (DV)
Diesel
Engine oil top up capacities
Engine Capacityinlitres(gallons)
1.25L Duratec-16V (Sigma)/1.4L Duratec-16V (Sigma)/ 0.8 (0.2)
1.6L Duratec-16V Ti-VCT (Sigma)
1.4L Duratorq-TDCi (DV) Diesel/1.6L Duratorq-TDCi (DV) 1.6 (0.4)
Diesel
136


mk6 did have a 45L tank though IIRC

as for the 35L, they always err on the side of caution when telling you how low your diesel level is - because if you do ever run dry, its not a straightforward job getting it running again (like it is with the petrols) - you have to prime the engine using the handpump for example!

#10 rojariggs

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Posted 17 February 2012 - 10:58 AM

you have to prime the engine using the handpump for example

Is that still the case with modern diesels? I was told you didn't have to any more and I did run my Freelander (52-reg with the BMW diesel engine) out of diesel a couple of times and it just restarted after chucking a a couple of gallons of diesel in...??

Mind you, I'm not about to try it with the Fiesta to test the theory...

#11 orcomma

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Posted 17 February 2012 - 12:47 PM

Is that still the case with modern diesels? I was told you didn't have to any more and I did run my Freelander (52-reg with the BMW diesel engine) out of diesel a couple of times and it just restarted after chucking a a couple of gallons of diesel in...??

Mind you, I'm not about to try it with the Fiesta to test the theory...


thats news to me !!

makes sense, surely in this day and age, a handpump could at least be electrified and wired to the ECU..

#12 rojariggs

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Posted 17 February 2012 - 12:55 PM

thats news to me !!

makes sense, surely in this day and age, a handpump could at least be electrified and wired to the ECU..

What I was told (by a BMW tech) was that modern car diesel engines generally will restart no problem simply due to the extremely high pressures involved - I guess a little bit of fuel goes a long way under pressure?

He did say that modern commercial vehicle and other larger diesel engines will still tend to struggle to restart after running dry.

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