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Old 05-15-2017, 02:24 AM   #76
vics stuff
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Hey Tbone1964 Where can a guy buy the fuel gauge resistor ?
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Old 05-22-2017, 02:28 PM   #77
Fasteddieb
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

i got mine at Radio Shack. I may have one lying around. If you want it let me know. It'll cost you a stamp!
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Old 05-23-2017, 11:01 PM   #78
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

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Originally Posted by Fasteddieb View Post
i got mine at Radio Shack. I may have one lying around. If you want it let me know. It'll cost you a stamp!
I believe he is referring to the stock porcelain type resistors.

You can use a 100 ohm resistor from Radio Shack but the stock style are much easier to install and there are plenty out there available.

Thanks for your in put on the subject,

Take care,
Tom
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Old 06-22-2017, 03:20 PM   #79
RWHSVAR
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

This is great information. I have been fighting with the fuel gauge on my 72 C10 for 2 months and getting nowhere. I replaced the tank sending unit which did not help. I just did the diagnostics in your post and got the following readings.

Picture 1 - 44.4 ohms I read 23.4 ohms
Picture 2 - 98.2 ohms I read 23.3 ohms
Picture 3 - 142.8 ohms I read 2.2 ohms

My best guess is a bad resistor. Do you agree? If so, where can I buy a new resistor. If I'm wrong, please advise next steps.

Thanks so much.
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Old 06-22-2017, 03:43 PM   #80
vics stuff
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

I also have found that time to time the resistors fail.
With what you indicate I would believe your problem is in the resistor.

.
They are available on this site.
Good luck.
Vic
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Old 06-22-2017, 05:33 PM   #81
RWHSVAR
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Thanks Vic,
I'll see if I can find the resistor. You said they are available on this site. Are you talking about 67-72chevytrucks.com? I don't see anywhere to buy them.

Thanks again.
Ron
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Old 06-23-2017, 12:34 PM   #82
RWHSVAR
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Does anyone have a source for the fuel gauge resistor on a 72 C`10?
Thanks,
Ron
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Old 06-28-2017, 08:01 PM   #83
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101

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Originally Posted by RWHSVAR View Post
Does anyone have a source for the fuel gauge resistor on a 72 C`10?
Thanks,
Ron
Hi Ron,

Send me a PM with your address information and I will send you a good resistor.

Typically the main problem when the resistor goes bad is you will never register more than 1/4 tank no matter how much fuel you have.

I don't see what photos you are refering to but the stock fuel gauge resistors will read around 90-100 ohms. The 23.3 ohms you have would only get your gauge up to 1/4 tank based on 90 ohms at full, 45 ohms at half and 22.5 ohms at 1/4 tank.

Hope this helps, let me know,

Tom
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