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Old 22-05-2010, 10:06 AM   #1
diatribal08
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Default Fuel gauge issues.

Hi having some trouble with fuel gauge, when tank full it reades full but drops down to empty (empty light comes on ) then goes back up to full again around every five minutes. When around half a tank just sits on a third and doesnt move DTE is useless and reads around 500Ks all the time ??? Please Help

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Old 22-05-2010, 10:20 AM   #2
aussiblue
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The sensor it the tank probably needs replacing or adjusting. It has a small arm that moves on a conductive track to vary the resistance to give a reading and that arm can either wear a groove in the track or move away from the track so that it makes intermittent contact.

If minor bumps in the road make the gauge change this is a good sign of the problem. It can sometimes be fixed by bending the arm so that it makes better contact or if it has worn a groove bending it so that it is no longer in the groove. However, given the hassle involved in removing the sender to repair it, it best just to replace it. And while a sparking shorting sender unit arm sitting in fuel fumes as it makes intermittent contact with the conductive track is not as actually as dangerous as it sounds, it something I prefer to avoid.

Also check the wiring harness plug closest to the sender is not damaged or loose.
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Old 22-05-2010, 11:22 AM   #3
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Cheers aussieblue what if gauge goes up and down car stationary and not running ??
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Old 22-05-2010, 11:29 AM   #4
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Quote:
Cheers aussieblue what if gauge goes up and down car stationary and not running ??
Often a bad earth check the earth wires at the battery - with ignition on have someone gently wiggle or shake them while you watch the gauge. Then do the same with the wiring harness under the dash and above the steering column.

Then try bouncing the car at the rear while you watch the gauge - if it moves it will point at the sender.
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Old 22-05-2010, 12:41 PM   #5
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Cheers mate will give it a go tnite.
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Old 24-05-2010, 02:37 AM   #6
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LPG model ... or petrol????
If LPG ... they have know issues with senders on the side of the tanks.
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Old 25-05-2020, 04:04 PM   #7
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Default Re: Fuel gauge issues.

Fg2 gage says 2/3rds bug tank is full, car says empty but can only fit 20L in can it be reset?
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