69 Fuel Gauge - Team Camaro Tech
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post #1 of 7 (permalink) Old Dec 29th, 09, 11:16 AM Thread Starter
Ron
 
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69 Fuel Gauge

Hey guys, I'm new to posting here, been lurking awhile, but I have a fuel gauge problem like so many others........I just joined the Camaro ranks with a purchase of a 69 Z, has the console with gauges, been running down some problems but the fuel gauge has me pulling my hair out! I have read just about every item here and at the Chevelle site and still puzzled. Here is a run down of the known;

Fuel gauge is pegged on full
New fuel gauge, I just replaced
Ohmed out the sending unit, it read 26 ohms, added 10 gallons of fuel and drove it a bit, now reads 59 ohms (also reads this at the harnsess where it plugs into console)
It goes to empty when the tan wire from the gauge is grounded in the trunk
The console plates are grounded along with the gauge (added extras to be sure)
The resistor on gauge is reading 40 ohms
Good Ground at the sending unit
Also unhooked trunk wire, placed the neddle in the middle, turned on power and still goes past full........

OK, I know I am missing something,

Also on another note, the temp gauge is also new, and about 10 seconds after I turn on power it will go to all the way past HOT, haven't started on that yet but may be related....
Thanks in advance for any help, Ron
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post #2 of 7 (permalink) Old Dec 29th, 09, 12:32 PM
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Re: 69 Fuel Gauge

Remove the fuel gauge resistor.
Make sure the temp sender body is grounded to the head/manifold.
Temp sender for a gauge? Should read above 1K ohms when cold, maybe 100-200 ohms when operating temp as felt by hot upper rad hose.

You could visit radio Shack or an electronics parts atore and buy a 0-1K variable resistor, any wattage would be fine, and use it to troubleshoot both problems.
Solder a length of wire with alligator clip to the center terminal and clip to tan wire, solder same to the left terminal and clip to ground. Now, dial in approx 90 ohms for full 40-50 ohms for half tank, 20-30 for 1/4 tank to work gas gauge.

Temp gauge same thing. I think 100 ohms for 180F indication. Temp sensor should be in the path of coolant, no adapters, as the further the end is in the better the reading.

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post #3 of 7 (permalink) Old Dec 29th, 09, 01:44 PM
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Re: 69 Fuel Gauge

welcome to team camaro!!!!..read the above post for the correct answer!!

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if you have an all original 1st gen camaro 67-69 click on the link below and enjoy the veiw and post your up!!
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post #4 of 7 (permalink) Old Dec 29th, 09, 03:04 PM
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Re: 69 Fuel Gauge

Oh yeah, Welcome to the Club!

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post #5 of 7 (permalink) Old Dec 29th, 09, 05:17 PM Thread Starter
Ron
 
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Re: 69 Fuel Gauge

Thanks guys, so do you think the new gauge has a built in resistor? I will remove the console once again, should have used velcro, and remove the resistor and retry. That is once the garage gets above freezing!
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post #6 of 7 (permalink) Old Dec 31st, 09, 07:07 AM Thread Starter
Ron
 
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Re: 69 Fuel Gauge

Thanks again guys, update, removed the resistor and now fuel gauge is reading 5/8 of a tank, appears that the resistor was the problem, now onto the temp sensor! Ron
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post #7 of 7 (permalink) Old Dec 31st, 09, 12:37 PM
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Re: 69 Fuel Gauge

Cool! Good work!
Fuel usage will determine the indication of the gauge.
Remember, it's only an approximate indicator.

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