Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace) - Page 5 - Team Camaro Tech
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post #61 of 103 (permalink) Old Aug 1st, 13, 09:08 AM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

Hey no problem - hope the guys at work find it is in working order with a set point lower then 56 Ohms


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post #62 of 103 (permalink) Old Aug 2nd, 13, 02:54 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

Well crud...still need the 100 Ohm pot to test the module (at the office) and Radio Shack does not carry one. Or is it a 100K ohm?

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post #63 of 103 (permalink) Old Aug 2nd, 13, 06:00 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

0-100 ohms would be ideal, but 0-1K has better availability.

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post #64 of 103 (permalink) Old Aug 2nd, 13, 06:36 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

Quote:
Originally Posted by Everett#2390 View Post
0-100 ohms would be ideal, but 0-1K has better availability.
I'll keep that in mind when I hit Frys. Frys claims they have this in stock.

http://www.frys.com/product/2915755


DO you have a procedure for testing the module? I'm going to be doing this out of the car. What to hook up where?

Thanks!

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post #65 of 103 (permalink) Old Aug 2nd, 13, 07:14 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

Radio Shack was out? Mine always has a bin full of them and they are cheaper too


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post #66 of 103 (permalink) Old Aug 2nd, 13, 08:30 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

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Originally Posted by 69-Pace View Post
Radio Shack was out? Mine always has a bin full of them and they are cheaper too
Not just out...they don't even list them on their website.

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post #67 of 103 (permalink) Old Aug 3rd, 13, 07:19 AM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

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Originally Posted by MMMM_ERT View Post
Not just out...they don't even list them on their website.
Sure they do. Here are the two that will work for what you are testing:
One is a Linear-Taper which means when in the mid way position resistance in Ohm's is equal on both lugs of the device. An Audio-Taper that is not quite true. I tend to think of it in stereo terms. One is the balance control (linear) and one is the volume control (Audio). Since we are only using one lug of the potentiometer either will work.

You jump the center lug to either of the side lugs, then use the two side lugs as the in and outs. You can just alligator clips or for a permanent toolbox diagnostic tool, solder the leads, and or mount it in a kit box with a knob and a face plate marking various resistance value milestones. Here are your Radioshack part numbers.


Option one:
Part number 271-1714 is an Linear-Taper

http://www.radioshack.com/product/in...ductId=2102789
This one should be in the pull out bin or can be ordered on-line and in store. Preference is for this Linear unit as opposed to the Audio pot listed below.

Option two:
Part Number 271-1722 This is an Audio-Taper


http://www.radioshack.com/product/in...ductId=2062358
This one is always located in the pull out bins unless you are in a large store in a heavy nerd community patronized like big nerds like me where it might actually have a peg hook on the wall.


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post #68 of 103 (permalink) Old Aug 3rd, 13, 07:44 AM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

And I forgot to include the link to JohnZ excellent description on testing using a potentiometer on Corvette C1 fuel senders in PDF format. A worthwhile save even though it is written for the Vette audience - the process is the same for all GM fuel senders of that period. Just think 0-90 when he is talking about 0-30 Ohm's for empty to full, 45 when it says 15 is half tank and its all the same.

http://www.lbfun.com/warehouse/tech_...lGaugeTech.pdf
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Last edited by 69-Pace; Aug 3rd, 13 at 08:04 AM.
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post #69 of 103 (permalink) Old Aug 3rd, 13, 10:16 AM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

Okay... I thought you said it had to be 100 Ohm.

These two are 5K Ohm and 100K ohm. Pardon my ignorance of electronics...but doesn't that that translate to 5000 Ohm and 100000 Ohm?

...and yeah...our Radio Shacks are mostly cell phones and accessories now. It's terrible.

Quote:
Originally Posted by 69-Pace View Post
Sure they do. Here are the two that will work for what you are testing:
One is a Linear-Taper which means when in the mid way position resistance in Ohm's is equal on both lugs of the device. An Audio-Taper that is not quite true. I tend to think of it in stereo terms. One is the balance control (linear) and one is the volume control (Audio). Since we are only using one lug of the potentiometer either will work.

You jump the center lug to either of the side lugs, then use the two side lugs as the in and outs. You can just alligator clips or for a permanent toolbox diagnostic tool, solder the leads, and or mount it in a kit box with a knob and a face plate marking various resistance value milestones. Here are your Radioshack part numbers.


Option one:
Part number 271-1714 is an Linear-Taper

http://www.radioshack.com/product/in...ductId=2102789
This one should be in the pull out bin or can be ordered on-line and in store. Preference is for this Linear unit as opposed to the Audio pot listed below.

Option two:
Part Number 271-1722 This is an Audio-Taper


http://www.radioshack.com/product/in...ductId=2062358
This one is always located in the pull out bins unless you are in a large store in a heavy nerd community patronized like big nerds like me where it might actually have a peg hook on the wall.

1968 Camaro RS/SS 350 - owned for 21 years


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post #70 of 103 (permalink) Old Aug 3rd, 13, 07:18 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

Basic question. I scooted under the tank and can't see a ground coming off the top of the tank on the passenger side anywhere!!! Anyone got a photo or is it in the assembly manual?

alan
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post #71 of 103 (permalink) Old Aug 3rd, 13, 07:20 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

Yes they are, but as long as they go to at least 100 Ohms you are okay.

Hard to find them 0 to just 100 Ohm's these days on the shelf. And if you have a higher top end you can use it for all three bastard children, the Water Temp gauge, Fuel Gauge and Tachometer.


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post #72 of 103 (permalink) Old Aug 3rd, 13, 07:27 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

100 ohm potentiometer


http://www.allelectronics.com/make-a...M-SHAFT/1.html
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post #73 of 103 (permalink) Old Aug 3rd, 13, 07:28 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

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Basic question. I scooted under the tank and can't see a ground coming off the top of the tank on the passenger side anywhere!!! Anyone got a photo or is it in the assembly manual?

alan
Yes it is in the AIM but like so much of it, not so clear. The screw is tiny and it is on the pass side of the pass side hanger nodule and hard to see because of the muffler.

Here is a picture during my recent prep for a new tank.
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post #74 of 103 (permalink) Old Aug 3rd, 13, 07:30 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

And that is the passenger side forward mount correct?

alan
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post #75 of 103 (permalink) Old Aug 3rd, 13, 07:32 PM
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Re: Gas Gauge Failure. . .How to fix...Thank you, Brian (69 Pace)

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And only a Dollar too! Thank's Alan.


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