fuel gauge problem - Team Camaro Tech
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post #1 of 6 (permalink) Old Dec 26th, 06, 04:22 PM Thread Starter
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Paul
 
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fuel gauge problem

Hi TC, I'm still having problems with my console fuel gauge on my '69. I purchased a new console gauge assy. from Matt's Classic Bowties month's ago and only recently put it in. My fuel gauge is at 1/4. I measured the sender wire in the trunk to grd. and got 80 ohms (close to full) and again behind the gauge and got 83 ohms. I still need to drain about 5 gallons out of the tank and hopfully my ohm reading will drop. I reconnected my wires and still read the same as I started. I lifted the sender wire behind the gauge and the needle stayed and didn't go to full. I connected a 40 ohms resistor to the gauge sender terminal to ground and the needle went to 1/4 full. I shorted the gauge sender terminal to grd. and the needle went to "empty". My volts is at 12v. and the ground seemed to be good. I even ran a jumper from the batt(-) to behind gauge (stud). My other gauges seems to be working along with all bulbs. Do I need a shunt resistor across the terminals of the gauge and if so, what size? I know I read it somewhere about the resistor, but need to confirm. I won't be able to work on car till the weekend but, any help would be appreciated. Thanks!!
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post #2 of 6 (permalink) Old Dec 26th, 06, 10:38 PM
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Re: fuel gauge problem

The new after market gauges do not require a shunt resistor. Sounds like you may have a bad new gauge.

Dennis
69 Z/28. 302DZ, Autogear M22, Red w/black stripes.
69 Camaro, ZZ4, 700R4, 8.5 3:42 posi, X11
70 Nova SS 396, 4sp, 3:55 12 bolt
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post #3 of 6 (permalink) Old Dec 26th, 06, 11:30 PM Thread Starter
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Re: fuel gauge problem

Thanks Dennis, i'm still gonna try and drain some fuel out of the tank to further isolate my Fuel Sender and connect a variable resister to simulate my senders resistance @ the gauge. Anybody else thinks the problem is the gauge.
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post #4 of 6 (permalink) Old Dec 31st, 06, 06:00 PM Thread Starter
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Paul
 
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Re: fuel gauge problem

Happy New Year everyone! Still having problems with my fuel gauge. I connected a potentiometer to my gauge ref to ground and the highest I could get was about 1/4 full with 40 ohms. I again lifted the ground and gauge didn't go to full. And remember I was getting 80 ohms at the sender wire in the trunk, now i'm getting 140 ohms. I drained about 5 gallons of fuel and my multimeter showed 2k ohms. So weird and frustrated. I came to the conclusion that my new fuel gauge and sender unit is bad. Never replaced my sender unit before, do I also replace the o-ring, locking ring and any other item? Thanks again! Have a safe and Happy New Years.
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post #5 of 6 (permalink) Old Dec 31st, 06, 06:08 PM
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Re: fuel gauge problem

Happy New Year to you too! When you order your sending unit, it should come with a new o-ring, but might ask so your not waiting again for parts. Replace the o-ring but use your original locking ring. The aftermarket rings are crap.
One other thing, did you check your ground wire on the back of the gas tank from the sending unit. (Axle side) It's held on by a small screw going to a bracket. Make sure you have a good and clean connection there.

Dennis
69 Z/28. 302DZ, Autogear M22, Red w/black stripes.
69 Camaro, ZZ4, 700R4, 8.5 3:42 posi, X11
70 Nova SS 396, 4sp, 3:55 12 bolt
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post #6 of 6 (permalink) Old Dec 31st, 06, 06:13 PM Thread Starter
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Re: fuel gauge problem

Thanks Dennis!
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