Fuel Gauge Not working - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 17 (permalink) Old May 1st, 10, 06:24 AM Thread Starter
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Scott
 
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Fuel Gauge Not working

Mine goes to
key on: Tan wire disconnected (not grounded) full on gauge
Key on: Tan wire disconnected with jumper to ground full!
Key on: Tan wire disconnected with jumper to ground and also disconnected ground near fuel sender and grounded that to a new ground and still goes to full

1969 Camaro Convertible 427 5 Speed
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post #2 of 17 (permalink) Old May 2nd, 10, 08:57 AM
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Re: Fuel Gauge Not working

If it always reads FULL. You may either have an Open circuit (wire is cut/broken) or a bad gauge. Verify the sender first by using an ohmmeter (0 ohms=Empty, 90 ohms=Full).

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post #3 of 17 (permalink) Old May 2nd, 10, 10:33 AM Thread Starter
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Re: Fuel Gauge Not working

When key is on and wires are hooked up correctly the gauge reads empty.

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post #4 of 17 (permalink) Old May 4th, 10, 06:31 AM Thread Starter
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Re: Fuel Gauge Not working

Quote:
Originally Posted by 77thor View Post
. Verify the sender first by using an ohmmeter (0 ohms=Empty, 90 ohms=Full).
Do this at the connector in the trunk?

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post #5 of 17 (permalink) Old May 4th, 10, 07:37 AM
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Re: Fuel Gauge Not working

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Originally Posted by provfirescott View Post
Do this at the connector in the trunk?
Yes you can do it from the connector in the trunk. Just make sure you are on the wire going to the sending unit and not the wire to the guage.

Since you have the wire to the guage grounded and with key on it goes to empty,,then the wiring and guage are good.

What kinda reading do you get on the wire to the sending unit.

There is also a ground wire that connects to the fuel tank strap for the sending unit. You might check that connection and wire.

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post #6 of 17 (permalink) Old May 4th, 10, 04:13 PM Thread Starter
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Re: Fuel Gauge Not working

Got 12.5 on the ohms.

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post #7 of 17 (permalink) Old May 4th, 10, 05:29 PM
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Re: Fuel Gauge Not working

Equals around 1/8 tank level.

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post #8 of 17 (permalink) Old May 4th, 10, 07:14 PM
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Re: Fuel Gauge Not working

Are you getting any voltage at the tan wire in the trunk? Should be 12V there with no current flow. Assuming there is voltage at the guage you have an open circuit between the gauge and the connector in the trunk.

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post #9 of 17 (permalink) Old May 5th, 10, 08:41 AM Thread Starter
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Re: Fuel Gauge Not working

Let you know tomorrow doing a 24 at work today

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post #10 of 17 (permalink) Old May 6th, 10, 01:53 PM Thread Starter
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Re: Fuel Gauge Not working

Key on
Plug unplugged
Getting 6.53 from tan wire

1969 Camaro Convertible 427 5 Speed

Last edited by provfirescott; May 6th, 10 at 03:23 PM.
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post #11 of 17 (permalink) Old May 6th, 10, 06:15 PM
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Re: Fuel Gauge Not working

Voltage into gauge from electrcal source?
If tan wire is unplugged, as said, 12 volts, or battery voltage minus 0.5 volt, maybe.
If tan wire plugged in, battery voltage to gauge, reduced voltage through gauge.

If you measured 12-13 ohms to ground with tan wire unplugged, then approximately 1/8 tank level.
If you insert a 100 ohm resistor from gauge terminal tan wire was hooked to and ground the other resistor lead, full tank should be indicated - only with tan wire unplugged.

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post #12 of 17 (permalink) Old May 8th, 10, 11:17 AM Thread Starter
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Re: Fuel Gauge Not working

Dropped gas tank today..............Broken wire on sender!

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post #13 of 17 (permalink) Old May 8th, 10, 04:43 PM
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Re: Fuel Gauge Not working

It's always something but at least you found the cause!!!

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post #14 of 17 (permalink) Old May 8th, 10, 05:48 PM
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Re: Fuel Gauge Not working

That tan wire is protect pretty good. Can you tell what caused it to break?

Roger

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post #15 of 17 (permalink) Old May 9th, 10, 06:04 AM Thread Starter
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Re: Fuel Gauge Not working

It pulled right out of the rubber boot/connector.Probably happened when I reinstalled tank over winter.
So I sliced the boot in half with razor blade crimped the wire back onto connector and heat shrunk it back together

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