need help with 1973 z fuel gauge

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bahrtman
Posts: 15
Joined: Fri Nov 28, 2014 12:56 pm
Car: 1973 240z
2003 350z track
2012 titan sl
Location: PA

Post

My fuel gauge is not working properly. It fluctuates between 1/8 and empty continuously. I replaced the float switch but it didn't change at all. Any suggestions would be appreciated. I hope I don't need to replace the gauge!


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VStar650CL
Technical Expert
Posts: 9457
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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Ground the gauge signal wire where it enters the gauge, the needle should shoot to full. If not, the gauge is bad. If so, ground the other end of the signal wire at the tank. If the gauge shoots to full then the signal wire is good, otherwise it's open. If there's a separate sender ground wire, short between the signal wire and the ground wire. The gauge should again shoot to full, if so the ground wire is good. If that all checks out, the sender is shot.

bahrtman
Posts: 15
Joined: Fri Nov 28, 2014 12:56 pm
Car: 1973 240z
2003 350z track
2012 titan sl
Location: PA

Post

Thanks for your help. That should give me my answer!


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