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Fuel Gauge Bimetal Strip Contacts Arghhhh

Posted September 17, 201212 yr

71 240z resto. I cleaned with deoxit bench tested the gauge, installed and it lasted for 20min then stuck open.

I removed the gauge (thanks Escalon!) disassembled, filed the contacts, re-installed, it lasted for 20min then stuck open.

I swapped in the workings from a 280z gauge, did not touch the contacts , it lasted for 20min then stuck open.

It there something I am not doing? Sender is fine at 10ohms to 70ohms. Wiring is fine.

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September 17, 201212 yr

comment_401816

What voltage are you using? Are you hooking up the ground, too. The fuel pump uses a voltage divider.

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https://www.classiczcars.com/forums/topic/44421-fuel-gauge-bimetal-strip-contacts-arghhhh/#findComment-401816

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September 17, 201212 yr

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comment_401858

Stock wiring in the car. I Never removed current limiting resistors...maybe i should have installed one?

On a bench test I used 1 amp 12V wall-wart charger but too little current to run the gauge it would go to ~ 1/2. I did a quick check using battery and got full scale so good to go... and all worked fine in the car but then they danced around and slowly danced to below the F then stopped.