Fuel guage

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Fuel guage

Post by Sonarman » Thu Feb 28, 2019 8:03 pm

My fuel guage works fairly good but when I put the headlight switch to on it pegs full. Do you think I have a ground problem? Guage shows 3/4 when the tank of full. I can live with that.
Thanks in advance.

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Re: Fuel guage

Post by rmel » Thu Feb 28, 2019 9:41 pm

The Fuel gauge is basically an Ammeter, the more current the higher the reading.
The fuel sender is a variable resistor, Full is approximately 10 Ohms, Empty about 180 Ohms.
So first off, if your reading 3/4 when full check your ground connections. The ground at the
top of the tank is typically a weak spot. The 4 screws at the top of Fuel sender can loose
compression as the cork seal shrinks thus creating a poor contact and higher resistance
resulting in lower meter readings.
Puller: 71' 710K 2.7L EFI aka Mozo
Follower: Sankey MK 3, 3/4 Tonne
Rescue Pinz: 73' 712M

Driver: Ron // KO0Q

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norcal pinz
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Re: Fuel guage

Post by norcal pinz » Sun Oct 18, 2020 10:57 am

yes the fuel guage pegging when the lights are turned on is a bad ground i was having this issue too.
710M 1972
710k 1974

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