Wild fuel gauge

victorgte · 3rd July 2021, 08:22

The ZT fuel gauge is moving quite a bit. Filled it up last week and the reading can move between full and half as the journey goes.
If I disconnect the battery, upon reconnecting the gauge will read zero with the warning light on. 5 minutes into the trip it will then work and find its level.
Is this common on the 75/ZT?
If I fill up every 400 miles I’m confident I’ll not run out of fuel!
I’m guessing the sender needs replacing?

T-Cut · 3rd July 2021, 08:45

Hello Victor, the problem you describe is very common, more especially in diesel models, but not exclusively by any means. There are lots of discussions on the topic, an example of which is this: https://the75andztclub.co.uk/forum/s...ght=fuel+guage
The cause is generally thought to be caused by wear on the rheostat resistor attached to each fuel level float arm. There's a HowTo on fixing/replacing the rheostat somewhere in the archive. It would be worth doing some keyword searching to locate it.

EDIT: Image from Frenchmike

TC

3rd July 2021, 08:22	#1
victorgte I really should get out more....... MGTF, MGZT, Range Rover Join Date: Sep 2013 Location: Cheltenham Posts: 2,803 Thanks: 395 Thanked 633 Times in 446 Posts	Wild fuel gauge The ZT fuel gauge is moving quite a bit. Filled it up last week and the reading can move between full and half as the journey goes. If I disconnect the battery, upon reconnecting the gauge will read zero with the warning light on. 5 minutes into the trip it will then work and find its level. Is this common on the 75/ZT? If I fill up every 400 miles I’m confident I’ll not run out of fuel! I’m guessing the sender needs replacing? __________________ MG TF 135, MG ZT, Range Rover P38

3rd July 2021, 08:45	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Hello Victor, the problem you describe is very common, more especially in diesel models, but not exclusively by any means. There are lots of discussions on the topic, an example of which is this: https://the75andztclub.co.uk/forum/s...ght=fuel+guage The cause is generally thought to be caused by wear on the rheostat resistor attached to each fuel level float arm. There's a HowTo on fixing/replacing the rheostat somewhere in the archive. It would be worth doing some keyword searching to locate it. EDIT: Image from Frenchmike TC Last edited by T-Cut; 3rd July 2021 at 08:50..