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Old 03-30-2017, 03:46 PM   #1
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Fuel gauge indicated over full

My fuel gauge indicates way over full. When I stopped the engine and started again, the gauge went back to normal. Then after a while the needle went back to over full. Any help?
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Old 03-30-2017, 05:37 PM   #2
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The fuel gauge has 2 components, the dash gauge and the variable resistor in the tank. The variable resistor is connected to ground. A float on a rod floats in the fuel and adjusts the current flow as the float raises or lowers. The least resistance is the full reading. The gauge contains a bimetallic strip that is heated by a heat coil. As the heat increases, the needle goes to full.

Often when the fuel gauge doesn't work, it's a bad connection. A bad connection should make the gauge stay at empty. In your case, staying above full, it could be the voltage regulator in the dashboard that makes sure the voltage to the gauge stays the same. (if it wasn't in the circuit, high voltage would give a high reading, low voltage would give a low one.)

It sounds like the voltage regulator is bad. You'll have to search to find where it is in your dash, often attached to the 12v (+) lead to the gauge.
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Old 03-30-2017, 06:08 PM   #3
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Hmm... many years ago, when my Rabbit's coolant temp gauge went from normal to high, the gas gauge did the same. Sadly, there was no refinery in my dear VW... it was the voltage regulator, which the two gauges shared.

This may have nothing to do with your coach, but I enjoyed remembering the incident, just the same!
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Old 03-30-2017, 07:11 PM   #4
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Quote:
Originally Posted by BFlinn181 View Post
The fuel gauge has 2 components, the dash gauge and the variable resistor in the tank. The variable resistor is connected to ground. A float on a rod floats in the fuel and adjusts the current flow as the float raises or lowers. The least resistance is the full reading. The gauge contains a bimetallic strip that is heated by a heat coil. As the heat increases, the needle goes to full.

Often when the fuel gauge doesn't work, it's a bad connection. A bad connection should make the gauge stay at empty. In your case, staying above full, it could be the voltage regulator in the dashboard that makes sure the voltage to the gauge stays the same. (if it wasn't in the circuit, high voltage would give a high reading, low voltage would give a low one.)

It sounds like the voltage regulator is bad. You'll have to search to find where it is in your dash, often attached to the 12v (+) lead to the gauge.


Thanks, great info. I will check this, on the road right now, Ifoind I could use my scan gauge to know how fuel I use.
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Old 03-30-2017, 07:12 PM   #5
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Originally Posted by l1v3fr33ord1 View Post
Hmm... many years ago, when my Rabbit's coolant temp gauge went from normal to high, the gas gauge did the same. Sadly, there was no refinery in my dear VW... it was the voltage regulator, which the two gauges shared.

This may have nothing to do with your coach, but I enjoyed remembering the incident, just the same!


I will check the other gauges, maybe related, thanks
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Old 04-06-2017, 12:05 PM   #6
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All other gauges are good. The fuel gauge indicates good when cold but when it warms up it indicates overfull.
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