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Fuel gauge reading

Posted: Sat Dec 26, 2015 9:41 pm
by 1900sr
As posted elsewhere I have an issue with my fuel gauge not reading full. In fact it seems to read low all down the scale. Onstar also reports that the tank is only 91% full when it is reporting a fuel level of 48 litres. The dealer has opened a technical query with Vauxhall but I was wondering if anyone else is having problems with the fuel gauge at all, or knows of anyone else reporting it?

Re: Fuel gauge reading

Posted: Sat Dec 26, 2015 10:39 pm
by astramaster
You did good creating a dedicated topic. Let's see if someone can help! ;)

When you fill the tank completely,
- what information do you get from OnStar application? (post print screen)
- what information do you get from instrument cluster? (post photo)

Re: Fuel gauge reading

Posted: Sat Dec 26, 2015 10:55 pm
by 1900sr
I haven't got a pic of the fuel gauge, but it reads approx 7/8 full. It did once read almost full, but after just one mile it was reading 7/8 full.

This is a screen shot of OnStar, this is pretty much what it does everytime.

Image

Re: Fuel gauge reading

Posted: Sat Dec 26, 2015 10:59 pm
by astramaster
Why do you have range in km and capacity in litres? Shouldn't be miles and gallons?

Re: Fuel gauge reading

Posted: Sat Dec 26, 2015 11:17 pm
by 1900sr
I set it to your foreign units ;) as it's easier to see how accurate it is. As one UK gallon is 4.54 litres and the app doesn't do decimal points it's more accurate to have it in litres. I usually have it reporting in miles, gallons and PSI

Re: Fuel gauge reading

Posted: Sat Dec 26, 2015 11:42 pm
by astramaster
1900sr wrote:I set it to your foreign units ;) as it's easier to see how accurate it is. As one UK gallon is 4.54 litres and the app doesn't do decimal points it's more accurate to have it in litres. I usually have it reporting in miles, gallons and PSI
Ah, ok. Good idea. :)

Re: Fuel gauge reading

Posted: Sat Dec 26, 2015 11:50 pm
by astramaster
If 48 litres is 91%, then 100% would be 52,7 litres.
We know that Astra K fuel deposit's capacity is 48 litres and Astra H/J is 52 litres.
There seems to be some error in the car's programming data related to fuel deposit's capacity.

Re: Fuel gauge reading

Posted: Sun Dec 27, 2015 12:01 am
by 1900sr
My thought was that the car's software thinks the tank is bigger than it is. I didn't realise the old model had a 52 litre tank, that is interesting.

As you can see from this screenshot the under-reporting stays constant, this one still seems to suggest the tank is approx 52 litres.

Image

Re: Fuel gauge reading

Posted: Sun Dec 27, 2015 12:33 am
by Razormatt
Here's mine I filled up Xmas eve and haven't used the car since I do notice the first quarter of my take seems to go down very quick drove less than a mile home from the petrol station so I'm guessing mine is under reading too

One thing I can't seem to get right the recommended psi says 32 but I have it set to Eco so should be 38 which is roughly what my tyres are set to and doesn't matter what load I change the tyres to doesn't seem to update the recommended

Also on the onstar website says ride quality Unknown

Re: Fuel gauge reading

Posted: Sun Dec 27, 2015 12:51 am
by astramaster
Similar cases of faulty fuel gauge are reported here: :o
http://www.astra-k-forum.de/index.php/T ... /?pageNo=1
(translated here)