Inconsistent FuelGauge Series 2

Technical advice Q&A

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SimonBrown
Posts: 101
Joined: Sun Dec 04, 2016 9:15 pm
Location: Solihull
Great Britain

#1 Inconsistent FuelGauge Series 2

Post by SimonBrown » Tue Mar 22, 2022 8:43 pm

My fuel gauge has become inconsistent. When started today the gauge read just over 1/2 full, a couple of miles later it was down to 1/4, then back to half and over about 15 miles varying between.
Would anyone have any ideas?
Thank you
Simon
Simon Brown
1969 S2 OTS
1998 XK8 Coupe
1993 Morgan Plus 4
1991 Mini Cooper 1.3i

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TGN
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#2 Re: Inconsistent FuelGauge Series 2

Post by TGN » Tue Mar 22, 2022 8:54 pm

It could be your 10v regulator on its way out.
Trevor.
62 FHC 8607**, 64 Panhard 24CT, 68 Mini Cooper, Caterham 7, 64 Mini pickup

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MarekH
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#3 Re: Inconsistent FuelGauge Series 2

Post by MarekH » Tue Mar 22, 2022 9:00 pm

If it is moving about dynamically, then it may be a poor connection somewhere, as this is a bimetallic gauge. If it stays at these different levels for some time, then the more likely possibility is that the wiper rheostat wires are now so corroded that they may be breaking up, so opening it up may reveal that you need a new sender.

It is unlikely to be the 10v regulator, as the water gauge is on the same circuit and no inconsistent water temperature readings have been reported.

kind regards
Marek

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SimonBrown
Posts: 101
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Location: Solihull
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#4 Re: Inconsistent FuelGauge Series 2

Post by SimonBrown » Tue Mar 22, 2022 9:05 pm

Thank you, I can confirm the temperature gauge is working normally
Simon
Simon Brown
1969 S2 OTS
1998 XK8 Coupe
1993 Morgan Plus 4
1991 Mini Cooper 1.3i

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rswaffie
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Location: Lincolnshire
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#5 Re: Inconsistent FuelGauge Series 2

Post by rswaffie » Tue Mar 22, 2022 9:27 pm

I had something very similar on my 3.8. I replaced the sender and it resolved the problem. The sender was only a year old so it was the last thing I swapped out! As per
Marvel’s post, If the other instruments connected to the regulator are ok, you can probably rule that item out.
Richard

S1 3.8 FHC Opalescent Golden Sand with Tan Trim 8895**
Now enjoying my diy nut ‘n’ bolt restoration. :swerve: :wrench: :hammer: :fingerscrossed:

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