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9th January 2022, 21:10 | #1 |
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Rover 75 Diesel fuel gauge issue
Hi everybody
Ive started noticing my fuel gauge is fluctuating from sometimes 3/4 full next time driven only half full then sometimes 1/4 tank ,I was wondering if it was a common fault ? maybe the float has a puncture and filling with Diesel ? anything else i can check before i remove seat to investigate. many thanks julian
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10th January 2022, 10:10 | #2 |
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Hi Julian,
If you search the forum you'll find an investigative thread by a member who discovered a worn section of the float rheostat on the fuel pump side. This fault occurs rarely but when it does it's always on a diesel. Perhaps that's because so little fuel is consumed therefore the contact remains in one position for an extended period of time and slowly erodes the track. Simon
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10th January 2022, 15:53 | #3 | |
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Quote:
many thanks
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This vehicle was the 53,401st 75 to run off the production line, out of 112,381 This vehicle was the 2,551st 75 CDT Club to be made out of 3,403 This vehicle was the 5,192nd 75 in White Gold Metallic (code: GMN) to be made out of 12,251 White Gold Metallic 75s My New Addition MGZT 190 Trophy Blue 2001 Petrol. |
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10th January 2022, 20:37 | #4 |
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11th January 2022, 07:38 | #5 | |
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Quote:
Simon
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11th January 2022, 11:20 | #6 |
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Just to compound the wandering fuel gauge issue, worn rheostat 'windings' is clearly a big part of it, but there appears to be more subtle effects related to the state of the engine at the time.
For example, in 2014 BigRuss noted: The fuel gauge and range on the message centre don't give an accurate reading until the engine temperature increases and the temp gauge reaches the 9 o'clock position. Don't ask for an accurate explanation, but my guess is the gauges are stabilised with regulator circuit. For those that don't believe me, give it a try. Look at the range from cold and again when warm. Applies to both petrol and diesel models. My thought on this is that the current/instantaneous fuel consumption data is used to calculate range (it's all there is to go on). As the engine warms up, the range is rationalised to a more 'normal' consumption figure. However, this begs the question as to how consumption rate is calculated. TC |
11th January 2022, 11:50 | #7 | |
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Quote:
Simon
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11th January 2022, 19:44 | #8 |
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Hi Julian, I've spent more hours than I care to remember trying to get to the bottom of this common problem (see the link above, thanks Simon ).
I will say that I'm 99% sure that your problem lies with worn tracks on one or both rheostats in your fuel tank senders. Unfortunately, as far as I know these are no longer available new, but it may be possible to swap them across from a low mileage petrol that's being scrapped ? Does anyone know if they're the same ?
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11th January 2022, 19:56 | #9 |
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Many thanks to everybody for helping me find the link and what a great informative link it is Sonic ZS take me hat off to ya for all your hard work , will keep a look out for replacement sometime in the future.
really appreciated all the help now i know whats going on. cheers julian
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This vehicle was the 53,401st 75 to run off the production line, out of 112,381 This vehicle was the 2,551st 75 CDT Club to be made out of 3,403 This vehicle was the 5,192nd 75 in White Gold Metallic (code: GMN) to be made out of 12,251 White Gold Metallic 75s My New Addition MGZT 190 Trophy Blue 2001 Petrol. |
11th January 2022, 20:31 | #10 |
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75 Conn CDT Tourer, 75 Conn SE V6, 75 Conn V6, 75 Conn CDTi Tourer, ZS 180 Join Date: Jan 2014
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Out of interest Julian, what sort of mileage is on your car ?
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