Dodgy fuel gauge - Page 2

gnu · 5th December 2020, 08:00

Quote:

Originally Posted by It runs

Again OSF abs sensor . I had the same . Had to change the whole hub in the end no Idea why new sensor cured for a week . So changed the lot then cured . If it is this bear with it for a bit and in due course your abs ligh should illuminate as well

Not doubting you, but how does the abs sensor affect the fuel gauge?

SD1too · 5th December 2020, 08:17

Quote:

Originally Posted by gnu

Not doubting you, but how does the abs sensor affect the fuel gauge?

I've noticed that if the low fuel level warning lamp illuminates when I start the engine from cold, after a short distance it extinguishes and the gauge needle actually rises a little. It's thought that this is because the gauge software takes account of the fuel consumption rate. This is calculated using the distance travelled which is derived from the wheel speed data from the ABS sensor.

Simon

SD1too · 5th December 2020, 08:23

Quote:

Originally Posted by Alex D

... I’ve noticed that the gauge has gone down quicker since I filled it up a few weeks ago than it did last time I filled up.

Hi Alex,

Ignore the gauge and do a brim-to-brim calculation on a full tank of fuel. Also, start walking the 800 yards to work. It will make you healthier, reduce wear and tear on your engine (and battery) and lower your fuel expenses.

Simon

Westonboy · 5th December 2020, 12:11

Quote:

Originally Posted by gnu

Not doubting you, but how does the abs sensor affect the fuel gauge?

I dont know the technical explanation., but it has been reported numerous times on this site over the years that a failed front offside abs sensor can affect both speedo and fuel guage.

MacRob · 6th December 2020, 00:26

My gauge never goes above 3/4 even when brimmed and never goes below a 1/4 even when the light comes on. It’s been doing this since I bought the car 18 months and 9000 miles ago. I now just go on miles driven to know when it’s getting low. When I get to 450 miles, I fill it up again. Still I would love to know why it doesn’t go above or below the marks mentioned. It was suggested that the float could have gotten tangled up if it has been removed at some point.

COLVERT · 6th December 2020, 11:26

Quote:

Originally Posted by MacRob

My gauge never goes above 3/4 even when brimmed and never goes below a 1/4 even when the light comes on. It’s been doing this since I bought the car 18 months and 9000 miles ago. I now just go on miles driven to know when it’s getting low. When I get to 450 miles, I fill it up again. Still I would love to know why it doesn’t go above or below the marks mentioned. It was suggested that the float could have gotten tangled up if it has been removed at some point.

It is definitely the tank unit.--Partially jammed or worn.

Boltonboy · 6th December 2020, 17:33

check your float arm on the in tank fuel pump it can come unclipped from the fuel pump assembly the filter can also come detached which can cause some issues my fuel gauge did what you are describing before my fuel pumps both broke on my CDTI 75, when I took the in tank fuel pump out my filter was in the bottom of the fuel tank and the float arm was unclipped once I put everything back in fuel gauge works fine now just take it out have a look you never know it could be a simple fix.

MacRob · 7th December 2020, 00:19

Quote:

Originally Posted by Boltonboy

check your float arm on the in tank fuel pump it can come unclipped from the fuel pump assembly the filter can also come detached which can cause some issues my fuel gauge did what you are describing before my fuel pumps both broke on my CDTI 75, when I took the in tank fuel pump out my filter was in the bottom of the fuel tank and the float arm was unclipped once I put everything back in fuel gauge works fine now just take it out have a look you never know it could be a simple fix.

How difficult is it to remove the sender and which side of the tank is it on

Boltonboy · 8th December 2020, 16:13

Quote:

Originally Posted by MacRob

How difficult is it to remove the sender and which side of the tank is it on

i took out the fuel pump assembly behind the drivers seat and replaced fuel pump clicked in float arm and reinstalled filter on bottom of fuel pump assembly and it seem to sort out my fuel gauge problems before it used to go up and down constantly very annoying while driving the main thing is to make sure you are careful when you reinstall pump assembly and float arm .

COLVERT · 8th December 2020, 18:50

Quote:

Originally Posted by MacRob

How difficult is it to remove the sender and which side of the tank is it on

Have you had a look in the How-Tos----Lots of posts and maybe the details you are needing are in there.---

6th December 2020, 00:26	#15
MacRob Loves to post Rover 75 Saloon Join Date: Sep 2019 Location: Deal, Kent Posts: 264 Thanks: 44 Thanked 81 Times in 58 Posts	My gauge never goes above 3/4 even when brimmed and never goes below a 1/4 even when the light comes on. It’s been doing this since I bought the car 18 months and 9000 miles ago. I now just go on miles driven to know when it’s getting low. When I get to 450 miles, I fill it up again. Still I would love to know why it doesn’t go above or below the marks mentioned. It was suggested that the float could have gotten tangled up if it has been removed at some point. __________________ MG Rover South East admin

6th December 2020, 17:33	#17
Boltonboy Avid contributor Rover 75 classic se cdti\ mg zt 120 /rover 75 club 1.8 Join Date: Aug 2020 Location: Bolton Posts: 166 Thanks: 85 Thanked 13 Times in 10 Posts	check your float arm on the in tank fuel pump it can come unclipped from the fuel pump assembly the filter can also come detached which can cause some issues my fuel gauge did what you are describing before my fuel pumps both broke on my CDTI 75, when I took the in tank fuel pump out my filter was in the bottom of the fuel tank and the float arm was unclipped once I put everything back in fuel gauge works fine now just take it out have a look you never know it could be a simple fix.