Fuel gauge goes up with no fuel added

Bolin · 25th August 2011, 11:23

Good afternoon chaps and chapesses

My fuel gauge appears to be linked to the predicted range of my car, giving strange readings that are really annoying!

E.g. after a bit of fiddly parking the gauge will drop dramatically, only to rise up again as I am driving steadily. Sadly it is not petrol pixies filling my tank for me on the move, just a 'clever' gauge that isn't.

Can this be turned off? I'm wondering if mine has this feature because it also has the trip computer with range readout (which also isn't always helpful), or do all 75 fuel gauges do this? I'd rather have a simple readout of what volume of physical go-juice is left.

Yours, with 'some' petrol in the tank, Bolin.

spyder · 25th August 2011, 11:35

It is linked to the MPG calculation on the next screen.
There are lots of how to's to set it up accurately, I have used it a few times and found it to be quite accurate-going down to a 16miles range, not clever, but at least it is more accurate than a reserve light.

If you do not want to see it, don not switch it on-ie the button on the indicator stalk.

Bolin · 25th August 2011, 12:17

Thanks for the reply, I haven't yet done the mpg calibration etc through the ODB.

What I really want though is the analogue fuel gauge itself not to listen to the current mpg when showing me how much petrol is left!

stocktake · 25th August 2011, 14:53

I am assuming you mean the fuel guage on the dash, the mechanical arm that reads full, 3/4, 1/2, 1/4 and empty. If so there is a fault. the guage has no input from anything other than the floats in the tank, how much fuel you have left in your tank will not vary if you do 2mpg or 200 mpg.

First thing to do is to check the plenums for water, unlikelyto be the cause but should be a priority

then you should turn your attention to the tank

Bolin · 25th August 2011, 15:43

OK, many thanks Stocktake, I assumed this was a 'design feature', not a fault!

There is no mention of this in the car's handbook or even in the Technical Brochure. So I have a strange fault.

Plenums are drier that a Yorkshireman's wit, as expected with the Plenum Shield fitted.

Anybody have any ideas as to why my fuel gauge is reacting to the car's mpg??

ZedTeeTee · 25th August 2011, 15:48

At what point is it changing? Is it through the whole range of the dial, or only in the bottom quarter?

Bolin · 25th August 2011, 16:02

Just the bottom quarter. This thread is related but it only seems to affect CDT owners:

http://www.the75andztclub.co.uk/foru...fuel+gauge+mpg

I wonder if it something to do with the fuel only picking off out of one side of the tank and taking a little bit of driving to equalize and hence correct the guage reading? I have the earlier fuel pump set up, but I thought it came out of both side with a guage float in both sides too.

wutang · 25th August 2011, 16:54

I don't consider it a fault but my V6 does the same thing, if i am driving on petrol (rare) and I am taking it easy and the needle is under the quarter if i then floor it and give the car a good italian tune up the needle will plunge to nothing, easing up again and the needle will go back up.

Always just asumed it was the car saying " if you drive me like that you need to visit the petrol station a little earlier."

has done it ever since I bought the car, never bothered me.

Richard

r75cdti · 25th August 2011, 16:58

I drive a cdti auto and my fuel guage does exatly the same.

bit skint this time of the month so i let it run down. when its warmed up with say 50miles left on the range its past the light but when its 1st started on way home from work or 1st thing in morning, the range goes right down and so does the needle. oh and my plenums are also dry.

ZedTeeTee · 25th August 2011, 17:24

Quote:

Originally Posted by Bolin

Just the bottom quarter. This thread is related but it only seems to affect CDT owners:

http://www.the75andztclub.co.uk/foru...fuel+gauge+mpg

I wonder if it something to do with the fuel only picking off out of one side of the tank and taking a little bit of driving to equalize and hence correct the guage reading? I have the earlier fuel pump set up, but I thought it came out of both side with a guage float in both sides too.

That's why I asked - mine does the same and I assumed (rightly or wrongly) it was just the tank finding it's own level, pumping from one side to the other. Only does it when it's really low though. Don't think it's a fault to be honest.

25th August 2011, 11:23	#1
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,624 Thanks: 289 Thanked 308 Times in 243 Posts	Fuel gauge goes up with no fuel added Good afternoon chaps and chapesses My fuel gauge appears to be linked to the predicted range of my car, giving strange readings that are really annoying! E.g. after a bit of fiddly parking the gauge will drop dramatically, only to rise up again as I am driving steadily. Sadly it is not petrol pixies filling my tank for me on the move, just a 'clever' gauge that isn't. Can this be turned off? I'm wondering if mine has this feature because it also has the trip computer with range readout (which also isn't always helpful), or do all 75 fuel gauges do this? I'd rather have a simple readout of what volume of physical go-juice is left. Yours, with 'some' petrol in the tank, Bolin.

25th August 2011, 11:35	#2
spyder This is my second home 75 CDT Auto Tourer , Rover 45 , Astra, Zaffira, Chev Captiva Join Date: Mar 2011 Location: Wilts Posts: 3,342 Thanks: 203 Thanked 436 Times in 360 Posts	It is linked to the MPG calculation on the next screen. There are lots of how to's to set it up accurately, I have used it a few times and found it to be quite accurate-going down to a 16miles range, not clever, but at least it is more accurate than a reserve light. If you do not want to see it, don not switch it on-ie the button on the indicator stalk. __________________ Chrome skull caps, EGR cleaned (original housing), Mondeo lower mounting, 12V outlets in the armrest and tourer boot, cat fixed, working FBH, Lidl plenum covers, DD with reverse camera.New speakesr/Tweeters with MDF rings. wood dash, Memory leather seats, wooden finished steering and handbrake, Xenon headlights.

25th August 2011, 14:53	#4
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,607 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	I am assuming you mean the fuel guage on the dash, the mechanical arm that reads full, 3/4, 1/2, 1/4 and empty. If so there is a fault. the guage has no input from anything other than the floats in the tank, how much fuel you have left in your tank will not vary if you do 2mpg or 200 mpg. First thing to do is to check the plenums for water, unlikelyto be the cause but should be a priority then you should turn your attention to the tank __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident Last edited by stocktake; 26th August 2011 at 10:19..

25th August 2011, 15:43	#5
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,624 Thanks: 289 Thanked 308 Times in 243 Posts	OK, many thanks Stocktake, I assumed this was a 'design feature', not a fault! There is no mention of this in the car's handbook or even in the Technical Brochure. So I have a strange fault. Plenums are drier that a Yorkshireman's wit, as expected with the Plenum Shield fitted. Anybody have any ideas as to why my fuel gauge is reacting to the car's mpg?? Last edited by Bolin; 17th March 2013 at 11:52.. Reason: spelling!

25th August 2011, 12:17	#3
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,624 Thanks: 289 Thanked 308 Times in 243 Posts	Thanks for the reply, I haven't yet done the mpg calibration etc through the ODB. What I really want though is the analogue fuel gauge itself not to listen to the current mpg when showing me how much petrol is left!

25th August 2011, 15:48	#6
ZedTeeTee This is my second home Rover 75 Saloon Join Date: Feb 2011 Location: Stanley Posts: 3,334 Thanks: 240 Thanked 303 Times in 172 Posts	At what point is it changing? Is it through the whole range of the dial, or only in the bottom quarter?

25th August 2011, 16:02	#7
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,624 Thanks: 289 Thanked 308 Times in 243 Posts	Just the bottom quarter. This thread is related but it only seems to affect CDT owners: http://www.the75andztclub.co.uk/foru...fuel+gauge+mpg I wonder if it something to do with the fuel only picking off out of one side of the tank and taking a little bit of driving to equalize and hence correct the guage reading? I have the earlier fuel pump set up, but I thought it came out of both side with a guage float in both sides too.

25th August 2011, 16:54	#8
wutang Posted a thing or two Rover 75 2.5 auto (LPG) & mg tf 160 Join Date: Nov 2006 Location: Dartford Posts: 1,124 Thanks: 5 Thanked 39 Times in 36 Posts	I don't consider it a fault but my V6 does the same thing, if i am driving on petrol (rare) and I am taking it easy and the needle is under the quarter if i then floor it and give the car a good italian tune up the needle will plunge to nothing, easing up again and the needle will go back up. Always just asumed it was the car saying " if you drive me like that you need to visit the petrol station a little earlier." has done it ever since I bought the car, never bothered me. Richard

25th August 2011, 16:58	#9
r75cdti Regular poster rover 75 Join Date: Dec 2010 Location: leigh on sea Posts: 43 Thanks: 0 Thanked 1 Time in 1 Post	I drive a cdti auto and my fuel guage does exatly the same. bit skint this time of the month so i let it run down. when its warmed up with say 50miles left on the range its past the light but when its 1st started on way home from work or 1st thing in morning, the range goes right down and so does the needle. oh and my plenums are also dry.