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Tool Talk Discussion Forum

OT Chevy gas gauge

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BobOHIO

06-10-2006 13:00:40




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I've got a 1979 Chevy 4x4 and the gas gauge reads full all of the time suddenly even when it isn't. If I disconnect the ground wire needle will go way past full. Pulled out the sending unit and if work the float by hand needle will go from way past full to about 3/4 full position. I checked resistance on unit and ranged from 9 to 120 while moving the float through its range. Is this unit bad? It just started this one day after a fill up at the gas station. New unit is $70 but didn't want to spend the money until I asked here for possibly something I'm missing. Thanks for any help. Bob
One more thing- I checked the voltage from the hot wire leading to the unit and it measured 8 volts. Shouldn't it be 12? Also all other gauges in the truck work fine.

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Revredneck

06-12-2006 05:14:15




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 Re: OT Chevy gas gauge in reply to BobOHIO, 06-10-2006 13:00:40  
Bob,
You need to check the dash unit before you buy a tank unit. Just ground the wire at the tank end, the gage should go straight to empty. If you have access to some kind of variable resistor, hook it up between the gage wire and ground. It should go smoothly between empty and full when the resistance goes between 90 and 0 ohms. Good luck and God Bless, Tommy



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BobOHIO

06-11-2006 07:10:00




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 Re: OT Chevy gas gauge in reply to BobOHIO, 06-10-2006 13:00:40  
Thanks Brad and Jake for helping. Thanks for explaining the less than 12 volts to the gauge. I'll order a new sending unit tomorrow. Bob



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Jake 2

06-10-2006 16:58:46




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 Re: OT Chevy gas gauge in reply to BobOHIO, 06-10-2006 13:00:40  
Sounds like bad sending unit here, also. I would also check the manual before I put 12 volts across the new unit. Sometimes the gage requirements are less than 12 volts. Some are as low as 5 volts, depending on make, model and particular gage.



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bradk

06-10-2006 13:14:57




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 Re: OT Chevy gas gauge in reply to BobOHIO, 06-10-2006 13:00:40  
I'd say the sender is bad.Resistance should be 90 ohms at full.~brad



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