Fuel gauge reading

Faults and Technical chat for the Vauxhall Astra K
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Razormatt
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Astra Model: Elite Nav 1.4T (150PS)
Astra Options: Parking Sensors
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Location: Kent - Drives: Carbon Flash 1.4T Elite Nav

Re: Fuel gauge reading

Post by Razormatt » Wed Jan 20, 2016 9:31 pm

I've noticed that from the first half of the tank I get around 140 miles and the second half I get around 200-220
Carbon Flash Elite Nav 1.4 (150PS) Turbo


sebati
Posts: 72
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Location: Ankara, turkey

Re: Fuel gauge reading

Post by sebati » Wed Jan 20, 2016 9:40 pm

Its almost same on my side. Second half is much slower. So there should be a problem. Well i know also, lots of astra k owner in turkey who are troubling with this issue. We've tried a few times to full the tank but we could fulled only 45Lt. Is there any possibility that capacity of fuel tank is 44 or something but not 48 Lt?
Last edited by sebati on Wed Jan 20, 2016 9:44 pm, edited 1 time in total.
Deep Sky Blue 1.6 CDTI 136 HP Execellence(Elite) MT6 MY2016 with 17" alloys + Winter Pack-2


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astramaster
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Re: Fuel gauge reading

Post by astramaster » Wed Jan 20, 2016 9:43 pm

How many hp is your engine, cornishtaz? (you also need to correct this info in the member's gallery)
It would be useful to compare and analyse all the affected engines...


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astramaster
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Re: Fuel gauge reading

Post by astramaster » Wed Jan 20, 2016 9:45 pm

sebati wrote:Its almost same on my side. Second half is much slower. So there should be a problem. Well i know also, lots of astra k owner in turkey who are troubling with this issue. We've tried a few times to full the tank but we could fulled only 45Lt. Is there any possibility that capacity of fuel tank is 44 or something but not 48 Lt?
Please inform also what's your engine.
It would be useful to compare and analyse all the different affected engines...


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1900sr
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Astra Model: SRi 1.0
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Location: Lincoln

Re: Fuel gauge reading

Post by 1900sr » Wed Jan 20, 2016 9:50 pm

sebati wrote:Its almost same on my side. Second half is much slower. So there should be a problem. Well i know also, lots of astra k owner in turkey who are troubling with this issue. We've tried a few times to full the tank but we could fulled only 45Lt. Is there any possibility that capacity of fuel tank is 44 or something but not 48 Lt?
I'm sure the tank is 48 litres, as the Onstar app does show 48 litres when the car is full, although it claims it's only 91% full at that. As I posted earlier in the thread

"As an aside, to get it absolutely full they recommend filling until first click, waiting a few seconds, going to second click, waiting again and going to third click. Apparently the design of the tank means the pressure build up a bit quicker than normal. The owners handbook does say after cut off it can be topped up with a maximum of two further doses."

Before when I was filling to first click, then immediately pressing the trigger again until second click I wasn't getting a full 48 litres.
1.0i Turbo SRi, Power Red.


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UKtekkie
Posts: 352
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Astra Model: SRi Nav 1.4T (due March)
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Location: Ipswich, red SRi Nav 1.4 (150ps)

Re: Fuel gauge read

Post by UKtekkie » Wed Jan 20, 2016 9:53 pm

I can understand that real world performance is unlikely to match standardised test conditions (which to be fair to Vauxhall are mandated for all cars and outside of Vauxhall's control). However, this doesn't explain why it's fuel measurement is so far out.
Also worked out my consumption I travelled 500.8 miles average reading was 61.8mpg, but if you work out mileage and fill up amount I get 52.6mpg.
So the car thinks it used 500.8 / 61.8 = 8.10 gallons
I'm guessing you topped up by 500.8 / 52.6 = 9.52 gallons

i.e. The car is out by 9.52 / 8.10 = 1.175 = 17.5%.

Now, there are two different gallons: A UK imperial gallon is 4.546 litres but a US gallon is 3.785 litres. The ratio is 1.2 or or 20%. I wonder if they've actually confused the two, especially if the software were developed by GM in the US.

(The spec says 48 litres or 10.5 imperial gallons which would be 12.6 US gallons.)

The litre value could be wrong too if they've used the wrong gallon/litre conversion.
Red Astra SRi Nav 1.4i (150) with Intellilux, Parking Pack, Sunroof, Climate Control, Winter Pack, AGR seat.


sebati
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Re: Fuel gauge reading

Post by sebati » Wed Jan 20, 2016 9:56 pm

nuno50 wrote:
sebati wrote:Its almost same on my side. Second half is much slower. So there should be a problem. Well i know also, lots of astra k owner in turkey who are troubling with this issue. We've tried a few times to full the tank but we could fulled only 45Lt. Is there any possibility that capacity of fuel tank is 44 or something but not 48 Lt?
Please inform also what's your engine.
It would be useful to compare and analyse all the different affected engines...

Yes of course. Mine is 1.6 cdti 136hp Mt6. But i know at least 10 owner of 1.4t 150hp who also have that problem.
Deep Sky Blue 1.6 CDTI 136 HP Execellence(Elite) MT6 MY2016 with 17" alloys + Winter Pack-2


sebati
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Location: Ankara, turkey

Re: Fuel gauge reading

Post by sebati » Wed Jan 20, 2016 9:58 pm

1900sr wrote:
sebati wrote:Its almost same on my side. Second half is much slower. So there should be a problem. Well i know also, lots of astra k owner in turkey who are troubling with this issue. We've tried a few times to full the tank but we could fulled only 45Lt. Is there any possibility that capacity of fuel tank is 44 or something but not 48 Lt?
I'm sure the tank is 48 litres, as the Onstar app does show 48 litres when the car is full, although it claims it's only 91% full at that. As I posted earlier in the thread

"As an aside, to get it absolutely full they recommend filling until first click, waiting a few seconds, going to second click, waiting again and going to third click. Apparently the design of the tank means the pressure build up a bit quicker than normal. The owners handbook does say after cut off it can be topped up with a maximum of two further doses."

Before when I was filling to first click, then immediately pressing the trigger again until second click I wasn't getting a full 48 litres.

But couldnt be possible that onstar also "thinks" that tank is 48 Lt. Have you ever succeed to full 45 or more Lt to tank?
Deep Sky Blue 1.6 CDTI 136 HP Execellence(Elite) MT6 MY2016 with 17" alloys + Winter Pack-2


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1900sr
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Astra Model: SRi 1.0
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Location: Lincoln

Re: Fuel gauge reading

Post by 1900sr » Wed Jan 20, 2016 10:20 pm

I've never run it empty enough to get 48 litres in, the most I've put in is 42 litres. However if Onstar thought the tank was 48 litres it would report it 100% when it thought it had 48 in. I believe the car thinks it has a 52litre tank. Certainly if I look at how much fuel Onstar reports it has before I fill up, and then add how much I put in it always works out at 48 litres.
1.0i Turbo SRi, Power Red.


ArcanumFox
Posts: 137
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Astra Model: AS 5DR SRI NAV 1.4I 150PS 6SP
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Re: Fuel gauge reading

Post by ArcanumFox » Thu Jan 21, 2016 10:50 pm

Hi guys,

I work in the Service Department of a Vauxhall dealership in the Midlands. I also personally own a 1.4 Turbo SRi Nav Astra K. I've been reading your posts and monitoring my own vehicle and identified a possible similar concern. I'm not considering it a warranty concern as yet until I've gathered more information. I've been considering raising a Technical Case with Vauxhall via our internal system for a few days but I know for this sort of problem they like documented evidence. I'm in the process of gathering this evidence for my own car (fuel receipts, OnStar images, mileage, driving conditions, etc).

Our local Technical Field Manager is coming to the dealership next week and I'll be raising these concerns with him to see the national extent of any reports on Astra K fuel consumption linked in with the OnStar app/fuel range. I'll report back with information on this & my own technical case response.

My own personal view is that it isn't a fuel economy or fuel consumption issue it's an issue with OnStar and/or the car fuel sensors incorrectly reporting size of the tank/fuel in the tank. This is a common issue in older Vauxhall's if you partially filled a tank it would often take some time to correctly update on the fuel gauge. I think a similar sort of 'lag' is occuring but possibly also resulting in confusing OnStar/car sensors so even if brimmed the software isn't accepting the correct value.

If it is OnStar the good news is this system has it's own power source/ECU and can be updated via the aerial so no dealership visit necessary.

I'm personally interested to see whether other models of Vauxhall with OnStar are reporting similar issues with the app/fuel range reporting incorrect values or just the Astra K.
Vauxhall Service Advisor in the Midlands
Astra K 2016 Registered 12/11/2015 1.4 Turbo (150BHP) SRi Nav Carbon Flash (Black)


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