fuel sending unit - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

1st Generation Specific 1979-1985 Discussion

fuel sending unit

Old 03-27-2009, 06:18 PM
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I just bought a 1982 Mazda RX7 and the fuel gadge does not work. What could the problem be? If it is the fuel sending unit where is it located at on this car.I also read a post that it could be a fuss that need replaced, where would that be. I sure could use expert advice from you guy's. This is my 1st mazda i like it a lot
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Old 03-28-2009, 12:33 AM
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well have you checked to see if its even connected behind the dash
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Old 03-28-2009, 07:23 AM
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I've moved this thread to the first gen forum. Hopefully, some of the very knowledgeable members here can help you find the solution.
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Old 03-28-2009, 11:38 AM
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sending unit is really easy to get to, if you look in the left rear wheel well, its right behind a plastic shield
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Old 03-30-2009, 07:22 PM
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I have had this problem before. Sometimes The variable resistor sending unit will get dirty over time. you could get off easy with just running a bottle or two of a good fuel system cleaner through it.. or you might have to remove it to clean it. you can check the unit with a multi meter.. use the ohm setting..

And of course check the wiring while you have the multi meter out.
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Old 01-14-2010, 09:05 PM
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I have a 1982 rx7 and my fuel gauge did not work when i got it. I replaced my fuel float/sending unit about a week ago and my fuel gauge works great. There is a good chance that is your problem its an easy fix if you are patient.
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