1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

my gas gauge doesn't work

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Old 07-11-06, 08:56 PM
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my gas gauge doesn't work

I have an '83 rx and my gas gauge only reads untill the tank is about half full/empty and then the needle just drops to empty. Is this a difficult fix?
Old 07-11-06, 10:50 PM
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New sending unit is $111 bucks, iirc, from Mazdatrix. Hardest part is getting the rusted screws out to replace the unit.
Old 07-12-06, 12:21 AM
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Does it read full when you fill it up??
Old 07-12-06, 01:11 AM
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Originally Posted by 84stock
Does it read full when you fill it up??
it does read full when I fill it up
Old 07-12-06, 01:18 AM
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If you get a partial reading on the fuel gauge, but not a full sweep, the resistance wires inside the sender are most likely broke at the point the gauge fails to read.
Old 07-12-06, 12:56 PM
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My fuel gauge (83) does the exact same thing. Reads full after filling, and for the first ~100 miles it will read somewhat accurate. After that, it's hit and miss. I have learned that a hard right hand corner will bring it back to a reading, for a couple minutes......
I just fill it up, and reset the trip odometer, then I start looking for a fuel station after around 250-300 miles, depending on whether I have been in town, or on the highway.
One of these days, I'll get around to pulling out sender, and see what's up with it, perhaps even replace it.
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