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Faulty fuel guage #662919
18/09/20 01:36 PM
18/09/20 01:36 PM
Joined: Sep 2017
Posts: 63
Buckinghamshire UK @ Phnom Pen...
R
Riverstar Offline OP
Just Getting Started
Riverstar  Offline OP
Just Getting Started
R

Joined: Sep 2017
Posts: 63
Buckinghamshire UK @ Phnom Pen...
The fuel guage on my 2006 4/4 has started to go from zero to full as soon as the ignition is turned on and stays there irrespective of the amount of fuel in the tank. The tank is a Mulfab extended range tank fitted before l bought the vehicle and l assume is fitted with a more sophisticated system thsn the old fashion float which could get stuck (or am I wrong).

Before l start undoing bits on the tank what checks should l take?

Thanks
Chris


2006 4/4 70th Anniversary Edition
2004 3.2 Audi TT Quattro
Re: Faulty fuel guage [Re: Riverstar] #662921
18/09/20 02:09 PM
18/09/20 02:09 PM
Joined: Dec 2017
Posts: 814
Evergreen, Colorado, USA
britmog Offline
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Evergreen, Colorado, USA
Check the electrical connections especially the earth.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: Faulty fuel guage [Re: britmog] #662922
18/09/20 02:13 PM
18/09/20 02:13 PM
Joined: Sep 2014
Posts: 1,722
London
MOG 615 Offline
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London
Originally Posted by britmog
Check the electrical connections especially the earth.


And particularly the earth of the gauge. Normally all the dashboard instruments share a common earth, but I am not so familiar with the 4/4 of that era.


Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
Re: Faulty fuel guage [Re: Riverstar] #662936
18/09/20 03:47 PM
18/09/20 03:47 PM
Joined: Feb 2016
Posts: 3,077
East Harling, Norfolk UK
Richard Wood Online NoMood
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Richard Wood  Online NoMood
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Joined: Feb 2016
Posts: 3,077
East Harling, Norfolk UK
Usually the earth associated with the fuel gauge is at the tank end and connected to one leg of the sender, if not independently then via the sender mounting. In the latter case there will be an earth connection from tank to chassis to check.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: Faulty fuel guage [Re: Riverstar] #662966
18/09/20 07:04 PM
18/09/20 07:04 PM
Joined: Sep 2017
Posts: 63
Buckinghamshire UK @ Phnom Pen...
R
Riverstar Offline OP
Just Getting Started
Riverstar  Offline OP
Just Getting Started
R

Joined: Sep 2017
Posts: 63
Buckinghamshire UK @ Phnom Pen...
If there was a earth problem wouldn't that result in no reading on the guage not the guage swinging to full?


2006 4/4 70th Anniversary Edition
2004 3.2 Audi TT Quattro
Re: Faulty fuel guage [Re: Riverstar] #662969
18/09/20 07:54 PM
18/09/20 07:54 PM
Joined: Jun 2015
Posts: 657
North Somerset, UK
Deejay Offline
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North Somerset, UK
It could even be an earth fault on the signalling wire between the gauge and sender. i.e. if the signal wire from the gauge to sender is connected direct to earth due to failed insulation along its length,, the gauge will read full. So try disconnecting at both ends and test the wire with a multimeter on ohms range to see if there is a spurious earth connection.


Doug

2011 +4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
Re: Faulty fuel guage [Re: Riverstar] #662976
18/09/20 09:06 PM
18/09/20 09:06 PM
Joined: Feb 2010
Posts: 947
SimonH Offline
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The fuel sender on a 2006 car is part of the in tank fuel pump assembly, and is an arm with a float

I might have a spare at the workshop


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: Faulty fuel guage [Re: Riverstar] #662988
18/09/20 10:17 PM
18/09/20 10:17 PM
Joined: Dec 2017
Posts: 814
Evergreen, Colorado, USA
britmog Offline
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Posts: 814
Evergreen, Colorado, USA
Originally Posted by Riverstar
If there was a earth problem wouldn't that result in no reading on the guage not the guage swinging to full?


No not necessarily, a loose or poor connection i.e. dirty can cause the gauge to go to default which is full. It is the simplest place to start fault finding and eliminating factors before starting to dismantle the fuel system.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: Faulty fuel guage [Re: Riverstar] #662990
18/09/20 10:25 PM
18/09/20 10:25 PM
Joined: Dec 2017
Posts: 814
Evergreen, Colorado, USA
britmog Offline
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Posts: 814
Evergreen, Colorado, USA
Did this start happening after you had filled the fuel tank? If it did had you filled the tank to first click of the pump or did you go beyond and kept filling through a number of clicks? If all this is the case then the float arm could be stuck in the up position, try giving the fuel tank a good shake when the fuel level is around half empty (as best you can estimate)


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: Faulty fuel guage [Re: Riverstar] #663004
19/09/20 07:28 AM
19/09/20 07:28 AM
Joined: Sep 2016
Posts: 489
Chester, UK
Grumpy2 Offline
Learner Plates Off!
Grumpy2  Offline
Learner Plates Off!

Joined: Sep 2016
Posts: 489
Chester, UK
Managed to brim my tank full last weekend, gauge showed 3/4!

Think I may have a sender problem there


94 plus 8 in Westminster Green - I think!
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