Fuel Gauge Issue

Mills2009 · 4th October 2018, 16:50

I had the front to back brake pipes replaced on the ZT-T a couple of months ago and since then, as per the title of this thread, the fuel gauge has not worked properly.

Having monitored it, the only time I seem to get an accurate reading is when the ingnition is first turned on and the car and engine are cold. Once running and everything is warm, the fuel guage keeps creeping up, so that generally it is reading about a third more fuel in the tank than you actually have.

I believe the fuel tank is dropped when these brake pipes are replaced, so something has gone awol during that process, I guess? Any help is greatly appreciated.

trikey · 4th October 2018, 17:42

Quote:

Originally Posted by Mills2009

I had the front to back brake pipes replaced on the ZT-T a couple of months ago and since then, as per the title of this thread, the fuel gauge has not worked properly.

Having monitored it, the only time I seem to get an accurate reading is when the ingnition is first turned on and the car and engine are cold. Once running and everything is warm, the fuel guage keeps creeping up, so that generally it is reading about a third more fuel in the tank than you actually have.

I believe the fuel tank is dropped when these brake pipes are replaced, so something has gone awol during that process, I guess? Any help is greatly appreciated.

Im guessing a stretched wire or a trapped wire,remove the rear seat base and have a look at the plug on top of the tank.

RoverP480 · 4th October 2018, 21:39

I wonder if one of the two senders in the tank has come adrift although looking t the wiring diagram it looks as though a break in the circuit would stop it working.

Mills2009 · 5th October 2018, 19:35

Thanks for the responses. I certainly need to see what’s going on under the seat base and check wiring etc. Or at least, find somebody more knowledgable than me to do it!

HarryM1BYT · 5th October 2018, 19:56

There are two level sensors, one for each side of the tank, which is like a saddle shape. The two values are fed to the dash which does a bit of wizardry, to calculate an actual level. Your problem suggests it is not getting a proper reading from one side. Under the rear seat, there is a removable access panel to the tank wiring.

T-Cut · 6th October 2018, 08:42

You could check the rheostat readings:

TC

SD1too · 6th October 2018, 10:33

Quote:

Originally Posted by Mills2009

I had the front to back brake pipes replaced on the ZT-T a couple of months ago ...

Michael; don’t touch anything and take your car back to the garage. If they have introduced a new fault it is their responsibility to rectify it, not yours.

Simon

4th October 2018, 16:50	#1
Mills2009 Avid contributor 1999 75 Auto & 2005 ZT-T Auto Join Date: May 2009 Location: Gloucestershire Posts: 187 Thanks: 6 Thanked 9 Times in 7 Posts	Fuel Gauge Issue I had the front to back brake pipes replaced on the ZT-T a couple of months ago and since then, as per the title of this thread, the fuel gauge has not worked properly. Having monitored it, the only time I seem to get an accurate reading is when the ingnition is first turned on and the car and engine are cold. Once running and everything is warm, the fuel guage keeps creeping up, so that generally it is reading about a third more fuel in the tank than you actually have. I believe the fuel tank is dropped when these brake pipes are replaced, so something has gone awol during that process, I guess? Any help is greatly appreciated. __________________ Commission number ZT31796. Believed to be the last CDTi 135 automatic ZT-T ever built. The last ZT-T to be produced in Black Pearl, being the 437th of 437.

4th October 2018, 21:39	#3
RoverP480 Gets stuck in None at the moment Join Date: Jan 2018 Location: Hereford Posts: 501 Thanks: 1 Thanked 165 Times in 146 Posts	I wonder if one of the two senders in the tank has come adrift although looking t the wiring diagram it looks as though a break in the circuit would stop it working. Last edited by RoverP480; 4th October 2018 at 21:45..

5th October 2018, 19:35	#4
Mills2009 Avid contributor 1999 75 Auto & 2005 ZT-T Auto Join Date: May 2009 Location: Gloucestershire Posts: 187 Thanks: 6 Thanked 9 Times in 7 Posts	Thanks for the responses. I certainly need to see what’s going on under the seat base and check wiring etc. Or at least, find somebody more knowledgable than me to do it! __________________ Commission number ZT31796. Believed to be the last CDTi 135 automatic ZT-T ever built. The last ZT-T to be produced in Black Pearl, being the 437th of 437.

5th October 2018, 19:56	#5
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	There are two level sensors, one for each side of the tank, which is like a saddle shape. The two values are fed to the dash which does a bit of wizardry, to calculate an actual level. Your problem suggests it is not getting a proper reading from one side. Under the rear seat, there is a removable access panel to the tank wiring. __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money.

6th October 2018, 08:42	#6
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	You could check the rheostat readings: TC