Fuel Gauge Not Working - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 11 (permalink) Old Feb 22nd, 04, 07:46 AM Thread Starter
CB
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The fuel gauge doesn't work in my '69 Firebird, and was wondering where to start troubleshooting. How can I tell if it's the sender, gauge, or wiring? Thanks!

1999 GMC Sierra Z71, recently 'detailed'<br /><br />1969 Pontiac Firebird, 350, 3 spd auto, stock<br />Decided to start fixing her up<br /><br />2004 Firecat F6 EFI Sno-Pro
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post #2 of 11 (permalink) Old Feb 22nd, 04, 07:51 AM
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If the bird stuff is the same as the camaro stuff.....

The sender (in the tank) is a variable resister (something like 0-90 ohms??). The sender is also grounded with a wire.

There is a wire that goes from the sender up to the gauge.

There is the gauge itself. Check that thing out and make sure it's connected properly.


If you do that stuff it should help you narrow it down.

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post #3 of 11 (permalink) Old Feb 22nd, 04, 07:55 AM Thread Starter
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I don't see why it would be different between the two, that's why I posted here. How can I tell if the gauge is crapped out?

1999 GMC Sierra Z71, recently 'detailed'<br /><br />1969 Pontiac Firebird, 350, 3 spd auto, stock<br />Decided to start fixing her up<br /><br />2004 Firecat F6 EFI Sno-Pro
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post #4 of 11 (permalink) Old Feb 22nd, 04, 08:13 AM
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You would have to be able to hook the gauge up to a known good sendor or a variable resister and change the resistance to see if the gauge moves.

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post #5 of 11 (permalink) Old Feb 22nd, 04, 10:14 AM
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try this out, firebird should be the same as the camaro. i had a bad sender ground, ended up just changing the sender since it was in pretty bad shape.
http://members.core.com/~faldrich/fuelgage.htm

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post #6 of 11 (permalink) Old Mar 2nd, 04, 10:12 AM
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CB, what is the fuel gauge indicating? does it stay below E or is it way past full?

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post #7 of 11 (permalink) Old Mar 23rd, 04, 03:42 PM Thread Starter
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Quote:
Originally posted by camarorsconv:
CB, what is the fuel gauge indicating? does it stay below E or is it way past full?
It's sitting at about 1/8 or a little more, so I'm assuming it might be the gauge. The tank is bone dry right now, so I might drop the tank tomorrow and try to remove the sender...I've been working on the front end the last few days. Can I spin the nut retaining the sender on with a punch and hammer, or will I require a special tool?

1999 GMC Sierra Z71, recently 'detailed'<br /><br />1969 Pontiac Firebird, 350, 3 spd auto, stock<br />Decided to start fixing her up<br /><br />2004 Firecat F6 EFI Sno-Pro
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post #8 of 11 (permalink) Old Mar 23rd, 04, 04:34 PM
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[/QUOTE] Can I spin the nut retaining the sender on with a punch and hammer, or will I require a special tool? [/QB][/QUOTE]

I used a screwdriver and a hammer to tap on the lock ring to get it off. I also had to tap on one side then the opposite side and it was not the best fit.
If you do think it is the sending unit or the ground, look at the picture I had of my sending unit.
I had a bad ground crimp on connection for the ground and then also the connection between the flat cable and the through pin on the top circle of the sending unit where the wire to the gauge would plug onto.
I put a new crimp on terminal on the wire end and then soldered it and also soldered the pin connection to the flat cable after cleaning off all of the corrosion.
Jim
Possible Bad Sending Unit Connections

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post #9 of 11 (permalink) Old Mar 24th, 04, 04:32 PM Thread Starter
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Well, dropped the tank, measured the resistance, 1.6 ohms dry, added some gas from a jerry can, and was 12 ohms, so fuel sender seems to work. How many wires run to the connector that's supposed to be above the parking brake? I want to measure the resistance at the tan wire there, but there are a few connectors. The wiring could really be cleaned up on this car......

1999 GMC Sierra Z71, recently 'detailed'<br /><br />1969 Pontiac Firebird, 350, 3 spd auto, stock<br />Decided to start fixing her up<br /><br />2004 Firecat F6 EFI Sno-Pro
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post #10 of 11 (permalink) Old Mar 25th, 04, 02:57 AM
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CB,

It sounds like it's your gauge. If you had a bad ground, the gauge would either be inconsistent or be pegged way past Full.

As another check, I dropped the gas tank enough to be able to see into it. I used a wire to move the sending unit up and down. Obviously, you don't want to stick anything in the gas tank that potentially will cause a spark. If the gauge doesn't correspond to the movement of the sending unit, then it's probably your gauge.

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post #11 of 11 (permalink) Old Mar 25th, 04, 03:39 AM
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CB, sorry to hop on your post.


SOA-Nova , What if the guage is very eratic,1/4 tank on guage is empty one time,another time goes to empty, never seen it say full untill disconected ground&lt;?&gt; wire, way past full mark.

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