How many litres left when the warning light comes on? - Page 2 - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #11 of 45 (permalink) Old 01-01-2012, 19:10
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Originally Posted by andrewball1000
Quote:
Originally Posted by rogerblack
I wouldn't assume it, as these indicators aren't always linear and accurate.
Simplest way to check would be to wait until light comes on, then as soon as possible completely fill up tank. Tank capacity less fuel added will tell you how much was remaining in the tank.
Thanks Roger I did that today. The light came on on the M25 and I put 98 litres in after driving about 15miles. Did I only have 2litres left or is the tank bigger than 100litres or is the warning light reading late?
The indication isn't usually linear because the sender float is usually hinged near the top so that it moves through an arc rather than straight up and down. Depending on where the most arc is the "needle" may move faster at first or faster at last (if you get what I mean).

Worst of all are flat shallow tanks because a few mm's of depth can be quite a few litres of capacity. I filled up soon after going into the red a while ago and managed to get well over 90 litres into my Master's tank so I think the capacity is a "nominal" 100 litres but is in actual fact a few more than that in practice.

Do you have a trip computer? My Cipro does and that shows a range of about 70 miles when the light comes on - if that is true it means about 12 litres should be left.
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post #12 of 45 (permalink) Old 01-01-2012, 19:26 Thread Starter
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Originally Posted by cabby
I just cannot believe you let your tank get that low.or was it a one off to find out.

cabby
Yes Cabby it was a one off as I had never had the light come on before. I was in a safe place and close to home and near filling stations I knew.
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post #13 of 45 (permalink) Old 01-01-2012, 19:35 Thread Starter
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Originally Posted by Stanner

Do you have a trip computer?
Thanks Stanner. Not that I know of but my Renault handbook does cover it so I will check.

I get 28mpg regularly which is 6mpl so I should have 60miles left when the light comes on. This seems high to me so I wont rely on it.

I assume there is no other warning before the engine stops!
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post #14 of 45 (permalink) Old 01-01-2012, 19:50
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Originally Posted by andrewball1000
Thanks Stanner. Not that I know of but my Renault handbook does cover it so I will check.
If the end of the stalk that doesn't contain the horn is a button (like the horn button) you have a trip computer - if the end is a solid lump of plastic you don't.


Quote:
I get 28mpg regularly which is 6mpl so I should have 60miles left when the light comes on. This seems high to me so I wont rely on it.
About the same as I do.


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I assume there is no other warning before the engine stops!
I haven't found out yet.
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post #15 of 45 (permalink) Old 01-01-2012, 20:00
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I have always had it drummed into me by others who know more about these things than me that you should NEVER let a diesel run out completely. I carry a 5l container for emergencies (with the aim of topping up BEFORE actually running out). However I try never to go much below about 1/4, have only ever had the light come on once or twice over the years.

cheers
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post #16 of 45 (permalink) Old 01-01-2012, 21:04
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I broke into a sweat when I read this - reminded me of our drive up to Edinburgh last June, on a Sunday, with various petrol stations closed.

I was using the trip thingy that told me, when we finally found an open station at Musselburgh, we had all of 6 miles left in the tank!!

Of course, I didn't tell hubby this till we'd filled up!!
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post #17 of 45 (permalink) Old 01-01-2012, 22:11
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I never fill up our X250 when the fuel light comes on as I can only get 65 litres into a 90 litre tank, I generally do 50-75 miles and still only usually get no more than 80 litres in.
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post #18 of 45 (permalink) Old 01-01-2012, 22:19
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We have 2006 Renault Master holds 100 litres has 8 lines I never get it down to last line or bar as I can usually get nearly 100 litres in it so am thinking the last bar probably isn't very accurate.

Got 32 to gallon out of it today first time ever! Must have been going downhill from Kelso to Leeds.

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post #19 of 45 (permalink) Old 01-01-2012, 22:25
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Hi.
Lots of nasties in the bottom of some fuel tanks,getting sucked up into the fuel filter,also although the tanks on same models are the same,sometimes the Stack pipe is not as long,so will not suck up the last few litres. Just an observation,as has been said before,todays filling stations are state of the art,just old habits die hard,i use half full as "Light on",without motion lotion,you stay where you are.
Ted.
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post #20 of 45 (permalink) Old 02-01-2012, 06:47
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Send a message via MSN to Rapide561
Fiat

Hi

The previous Fiat 3.0 had a light that came on too. I could gurantee 18 litres were remaining, so pretty much 100 miles worth.

This new van, again a 3.0 Fiat, the light comes on when it wants. Anywhere between about 20 litres and 12 litres (based on what was added at the fuel stop moments later)

Use it as a very rough guide only.

Russell
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