Gas gauge trouble - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 23rd, 08, 04:55 PM Thread Starter
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Dan
 
Join Date: Nov 2006
Location: Fenwick Ont. Canada
Posts: 70
Gas gauge trouble

I did the search and found many articles on trouble shooting the gas gauge and sending unit but I did not come across any one having the same problem as me.

My car is a 69 camaro.
I am switching from dash fuel gauge to console gauge package.
The assembled gauge kit is from Camaro Specialties in East Aurora NY.


Here are the results from following everyones trouble shootig processes.

1. Tan wire from gauge to good ground-----Gauge showed right on empty.

2. Tan wire from gauge disconnected------Gauge showed past full mark.

3. Tan wire from gauge thru 90 ohm resistor to good ground----Gauge showed 5 lines up from empty line.

4. Tan wire from gauge thru 45 ohm resistor to good ground-----Gauge showed 2 1/2 lines up from empty line.

5. Tan wire from gauge to tank sender-----Gauge showed 3 lines up from empty line.

6. Gas sender wire thru ohm meter to good ground-----Meter showed 53 ohms.

My question is why is the gauge not showing the proper level of the gas tank????
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post #2 of 5 (permalink) Old Oct 23rd, 08, 06:35 PM
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Alan
 
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Location: Indian River Chevrolet,
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Re: Gas gauge trouble

I had issues with my factory pod guages, (gas ), I installed extra grounds and it took care of mine.1969 Camaro SS
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post #3 of 5 (permalink) Old Oct 23rd, 08, 09:23 PM
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Greg
 
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Location: S. Florida
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Re: Gas gauge trouble

I'll take a stab, but I don't quite fully understand your measurements and wires, but here goes:

The stock OEM senders are 90 ohms full sweep/full tank, 0 ohms empty.
The pot on the sender attaches to a float rod that rides on the level of fuel.

#6 reading tells me you have a half tank of fuel if you are using an OEM type sender. (you stated 53 ohms)

Now, if you have a 90 ohm fuel gauge, it should read 1/2 tank.

If it doesn't read 1/2 tank,and I guess it doesn't, then bench test your gauge. With a power supply, and a variable resistor, determine at what resistance it takes to sweep the gauge to 100% full and again at 50%.
You could just add fixed resistors together if you don't have a variable.

It is possible to shunt the gauge with the correct size resistor (maybe) to get it to read right.

Need more info though.

1969 RS/SS Vert

1031 Engineering llc
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post #4 of 5 (permalink) Old Oct 24th, 08, 07:03 AM Thread Starter
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Dan
 
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Location: Fenwick Ont. Canada
Posts: 70
Re: Gas gauge trouble

Okay Greg.
I am going to try the variable resistor.

I am going to install the variable resistor and the 90 ohm resistor with the gauge hooked to ground and then turn the variable resistor till the gauge reads full. I will then check the variable resistor with the ohm meter to record the value.
I will then keep the variable resistor at the same level and replace the 90 ohm resistor with the 45 ohm resistor and see if the gauge reads half full.

If it does then I will wire in a resistor equal to the amount the ohm meter reads on the variable resistor and remove the variable resistor then hook up to the tank sendor and I should be just above half full.

What did you mean about needing more information??
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post #5 of 5 (permalink) Old Oct 25th, 08, 03:53 AM Thread Starter
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Dan
 
Join Date: Nov 2006
Location: Fenwick Ont. Canada
Posts: 70
Re: Gas gauge trouble

Okay problem solved.

I put the shunt resistor from the old dash fuel gauge on to the new console fuel gauge and now the gauge works properly.
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