S40 V40: - Low Fuel Level Light

leowyatt · Jan 16th, 2012, 14:52

So with all the fuel sender problems I had, the garage soldered the sender unit of mine so it now works and I get a reading, however the low warning light does not come on.

I went to fill up the other day because the needle was on the bottom line but I had no warning light. It does illuminate when the ignition is turned on so I know it works.

When I filled up at the pump I put in nearly 62L of fuel which considering the tank is 60L is rather odd. Surely I should have been out of fuel when I filled up.

mcouchard · Jan 16th, 2012, 15:48

Is it only 60 litre tank, last time I filled up (V40) I put 60 litres in it surely must be bigger? My previous megane was 65 litres.

pphilpot · Jan 16th, 2012, 15:56

Maybe our beloved petrol stations are ripping us off?

Dean1985 · Jan 16th, 2012, 16:12

i too have put in over 60 litres, it was only last week i put in 61.5!!!

leowyatt · Jan 16th, 2012, 16:19

So with the amount of fuel I put in the low level light should have come on, yes?

Dean1985 · Jan 16th, 2012, 16:33

Quote:

Originally Posted by leowyatt

So with the amount of fuel I put in the low level light should have come on, yes?

it should come on when theres 45 miles left in the tank,

leowyatt · Jan 17th, 2012, 09:44

Ok well I'll run this tank down and see if the light does indeed come on. I've got a 5L tank in the back incase I do run out.

pphilpot · Jan 20th, 2012, 09:07

I was playing around with my VIDA/DiCE gear last night and noticed that the system reads the car as having a 63L fuel tank. Not much difference to the book value of 60L, but a slight one all the same.

leowyatt · Jan 20th, 2012, 09:13

Ah ok. So with around 45 miles left in the tank should my low level light have come on? That would mean I only had around 1L left.

pphilpot · Jan 20th, 2012, 09:30

Difficult to know what happens.

I had a weird one recently - I usually get around 430 miles to 42 litres of diesel (going by my http://www.spritmonitor.de brief history) but the last fill up only gave me 262 miles to 40 litres - no change of driving at all. Something was wrong somewhere, but I've no idea where. It seems like the car is back to its normal fuel consumption now.

A quick Google came up with this thread of others questioning the accuracy of fuel pumps http://www.pistonheads.com/gassing/topic.asp?t=995965

Anyway...

If the fuel light is supposed to come on at 45 miles left (?) then that would roughly equal 5 litres or so of fuel remaining. Which would in turn mean that we would never be able to put more than 58 litres in if we fill immediately when the light comes on. I'd guess that that 45 miles is an arbitrary figure seeing that we have differing mpg rates and differing driving styles.

[edit] According to this Volvo page (about a third of the way down) LINK it states the following:

Quote:

9 Low fuel level warning light
When this light comes on, there are approximately 1.9 US gal. (7 liters) of fuel remaining in the tank.

Jan 16th, 2012, 14:52	#1
leowyatt Senior Member Last Online: Nov 25th, 2016 15:31 Join Date: Jul 2011 Location: St Helens	Low Fuel Level Light So with all the fuel sender problems I had, the garage soldered the sender unit of mine so it now works and I get a reading, however the low warning light does not come on. I went to fill up the other day because the needle was on the bottom line but I had no warning light. It does illuminate when the ignition is turned on so I know it works. When I filled up at the pump I put in nearly 62L of fuel which considering the tank is 60L is rather odd. Surely I should have been out of fuel when I filled up.

Jan 16th, 2012, 15:56	#3
pphilpot Premier Member Last Online: Jan 19th, 2024 15:24 Join Date: Oct 2006 Location: Woodbridge, Suffolk	Maybe our beloved petrol stations are ripping us off? __________________ ---------------------------------------------------------------------- Current: 2011 C30 1.6 D2 R-Design (155,000) Previous: 2004 S40 1.9D; 2004 S60 D5; 1996 V40 2.0; 1989 740 2.4 T

Jan 20th, 2012, 09:07	#8
pphilpot Premier Member Last Online: Jan 19th, 2024 15:24 Join Date: Oct 2006 Location: Woodbridge, Suffolk	I was playing around with my VIDA/DiCE gear last night and noticed that the system reads the car as having a 63L fuel tank. Not much difference to the book value of 60L, but a slight one all the same. __________________ ---------------------------------------------------------------------- Current: 2011 C30 1.6 D2 R-Design (155,000) Previous: 2004 S40 1.9D; 2004 S60 D5; 1996 V40 2.0; 1989 740 2.4 T

Jan 16th, 2012, 15:48	#2
mcouchard Master Member Last Online: May 31st, 2024 16:04 Join Date: Nov 2008 Location: Nottingham	Is it only 60 litre tank, last time I filled up (V40) I put 60 litres in it surely must be bigger? My previous megane was 65 litres.

Jan 16th, 2012, 16:12	#4
Dean1985 Master Member Last Online: Jun 4th, 2021 20:51 Join Date: Aug 2009 Location: Norwich	i too have put in over 60 litres, it was only last week i put in 61.5!!!

Jan 16th, 2012, 16:19	#5
leowyatt Senior Member Last Online: Nov 25th, 2016 15:31 Join Date: Jul 2011 Location: St Helens	So with the amount of fuel I put in the low level light should have come on, yes?

Jan 17th, 2012, 09:44	#7
leowyatt Senior Member Last Online: Nov 25th, 2016 15:31 Join Date: Jul 2011 Location: St Helens	Ok well I'll run this tank down and see if the light does indeed come on. I've got a 5L tank in the back incase I do run out.

Jan 20th, 2012, 09:13	#9
leowyatt Senior Member Last Online: Nov 25th, 2016 15:31 Join Date: Jul 2011 Location: St Helens	Ah ok. So with around 45 miles left in the tank should my low level light have come on? That would mean I only had around 1L left.

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