very strange fuel gauge problem - Team Camaro Tech
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post #1 of 11 (permalink) Old Mar 6th, 11, 03:20 PM Thread Starter
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Eric
 
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Angry very strange fuel gauge problem

a few years ago i took out the dash fuel gauge and installed a repro. factory tach. i put a stewart warner fuel gauge in the console along with other gauges into the autometer 4 gauge pod. everything worked great. then one day the fuel gauge got fogged up and white and started reading false.like its getting hot. sometimes it worked ok sometimes it will fog up. i started out with a new sending unit before,because the original one was bad.im under the impression that there is no resistor required with aftermarket fuel gauges ,is this correct? how can my fuel gauge do this ? it worked good off and on for quite a while. any input would really be appreciated.

Last edited by L30 327; Mar 6th, 11 at 05:50 PM.
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post #2 of 11 (permalink) Old Mar 6th, 11, 04:47 PM
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Re: very strange fuel gauge problem

If fuel gauge is fogging up, it's condensation.
Drill a small hole in the bottom and in the top to let the gauge vent.
The holes should be behind the mounting bracket to not show from the front.
Having the dash light on, will help evaporate the condensation.

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post #3 of 11 (permalink) Old Mar 6th, 11, 05:37 PM Thread Starter
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Re: very strange fuel gauge problem

the gauge does not work at all since last year. think i should try a new one?
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post #4 of 11 (permalink) Old Mar 6th, 11, 05:48 PM Thread Starter
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Re: very strange fuel gauge problem

i guess my main question is ,are any of you guys that are using aftermarket fuel level gauges have resistors on them,are they needed? i think mine overheated somehow. maybe a bad gauge?
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post #5 of 11 (permalink) Old Mar 7th, 11, 03:12 AM
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Re: very strange fuel gauge problem

Might buy a replacement gauge and maybe a resistor and try it with & without.
The resistor cuts down voltage, as in a voltage divider circuit, and provides a source for the sending unit.

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post #6 of 11 (permalink) Old Mar 7th, 11, 07:24 AM
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Re: very strange fuel gauge problem

I never have installed a resistor on aftermarket fuel guages. They usually have 3 wires on them.

+12vdc
ground
sending unit wire

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Last edited by prostreet69camaro; Mar 7th, 11 at 04:18 PM.
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post #7 of 11 (permalink) Old Mar 7th, 11, 08:54 AM
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Re: very strange fuel gauge problem

No resistor here. Autometer


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post #8 of 11 (permalink) Old Mar 7th, 11, 12:17 PM
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Re: very strange fuel gauge problem

Could just be a bad gauge. I would think if it needed a resistor, the manuf. would say so. If I was manufacturing them, I would incorporate the resistor in the unit and make it plug and play-makes for much happier customers, no?

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post #9 of 11 (permalink) Old Mar 8th, 11, 04:24 PM
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Re: very strange fuel gauge problem

Quote:
Originally Posted by BPOS View Post
No resistor here. Autometer
X2. Maybe the SW guage didn't like being in an Autometer pod. LOL
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post #10 of 11 (permalink) Old Mar 8th, 11, 08:32 PM
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Re: very strange fuel gauge problem

Maybe the moisture and gauge failure are related...
If moisture got in there, it may have caused some damage to the electronics of the gauge.

But, before replacing anything, I would measure the resistance of the sending unit at the gauge.
With the tank near empty it should be near 0 ohms, half full about 45 ohms and full about 90 ohms
It thats correct, its time for a new gauge.

But I don't know Stewart Warner gauges, not sure on this resistor thing. But if it needed a resistor I would think it would have had problems and shown the wrong fuel level from day one.
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post #11 of 11 (permalink) Old Mar 11th, 11, 06:38 AM Thread Starter
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Re: very strange fuel gauge problem

Well, I just checked my resistance from the sender wire to ground and got 6.4 ohms, and my tank is completely full. If I have to buy another sender it will be the third one. I wonder if my sender wire isint shorting to ground somewhere?
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