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Fuel Gauge Reads high. by Daryl M
Started on: 10-10-2019 01:40 AM
Replies: 5 (67 views)
Last post by: Daryl M on 10-10-2019 10:46 AM
Daryl M
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Report this Post10-10-2019 01:40 AM Click Here to See the Profile for Daryl MClick Here to Email Daryl MSend a Private Message to Daryl MEdit/Delete MessageReply w/QuoteDirect Link to This Post

Hi all,
My 87 GT has a fuel gauge that reads to high. When full it reads way above full and when empty it reads about 3/8 of a tank. I'm thinking a bad ground at the tank. What do all of you think?
Thanks,
Daryl

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82-T/A [At Work]
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Report this Post10-10-2019 02:19 AM Click Here to See the Profile for 82-T/A [At Work]Send a Private Message to 82-T/A [At Work]Edit/Delete MessageReply w/QuoteDirect Link to This Post

 
quote
Originally posted by Daryl M:

Hi all,
My 87 GT has a fuel gauge that reads to high. When full it reads way above full and when empty it reads about 3/8 of a tank. I'm thinking a bad ground at the tank. What do all of you think?
Thanks,
Daryl



When did this start? Did it just recently start to do this, or has it always done this and it's a car you recently acquired?

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olejoedad
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Report this Post10-10-2019 06:50 AM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post

No uncommon.
The fuel sender operates on a resistance circuit (0 - 90 Ω).
90 Ω is full.
There is either added resistance in the circuit or the gage or sender is out of calibration.
Added resistance could be from corrosion in the sender, a connector or grounding point.

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Daryl M
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Report this Post10-10-2019 09:48 AM Click Here to See the Profile for Daryl MClick Here to Email Daryl MSend a Private Message to Daryl MEdit/Delete MessageReply w/QuoteDirect Link to This Post

 
quote
Originally posted by 82-T/A [At Work]:
When did this start? Did it just recently start to do this, or has it always done this and it's a car you recently acquired?


The guage has not read accurately since I biught it i 2017.

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olejoedad
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Report this Post10-10-2019 09:53 AM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post

Forum member JGunsett offers gage recalibration services.
You can sender calibration with a DVM, and gage calibration with the proper value resistors.

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Daryl M
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Report this Post10-10-2019 10:46 AM Click Here to See the Profile for Daryl MClick Here to Email Daryl MSend a Private Message to Daryl MEdit/Delete MessageReply w/QuoteDirect Link to This Post

After reading your posts and checking an old post from 2016, i disconnected the connector at the firewall (502 I think) and tested there. The guage works properly. I then cleaned the connector and reconnected it and the guage reads just barely below full with about 10 miles since i filled the tank. Before testing it read way above full. I'm thinking that the connector was dirty or corroded a bit. Guess ill see when I run out of gas.
Daryl

[This message has been edited by Daryl M (edited 10-10-2019).]

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