Sending unit or guage
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Joined: Jan 2007
Posts: 80
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From: Sylvania Ohio
Sending unit or guage
A couple of days ago I asked for help with a fuel guage reading empty all the time. you guys said to check it there was power at the wire on the sending unit lug. there is no voltage now what.
Drifting
Joined: Oct 2007
Posts: 1,254
Likes: 5
From: Brown Summit North Carolina
Sounds like the sending unit?
But with out certianty that is an expensive part to take a chance on.
This is a screwy idea , but do you know someone with a car in the 68 thru 74 year range that runs and has a working gauge?
It seems to me that if you could back a car up to the back of your car and run test wire from your primary wire at the back of your car to the post on the sending unit on the test car. Will need to jump the ground wire also.
My idea is that you are attaching your gauge to the sending unit in the other car. If the gauge reads right , the you have confirmed the sending unit in your car as bad?
But wait for someone else to to chime in and say
yea that could work or HELL NO DON'T DO THAT
wish I could have been more help
David
But with out certianty that is an expensive part to take a chance on.
This is a screwy idea , but do you know someone with a car in the 68 thru 74 year range that runs and has a working gauge?
It seems to me that if you could back a car up to the back of your car and run test wire from your primary wire at the back of your car to the post on the sending unit on the test car. Will need to jump the ground wire also.
My idea is that you are attaching your gauge to the sending unit in the other car. If the gauge reads right , the you have confirmed the sending unit in your car as bad?
But wait for someone else to to chime in and say
yea that could work or HELL NO DON'T DO THAT
wish I could have been more help
David
Drifting
Joined: Jun 2005
Posts: 1,523
Likes: 1
From: grand prairie texas
I looked my 77 print and the fuel guage sender in the tank should not have voltage it is a variable resistor. You should have 12 volts to one side of your gauge and the other side of the guage runs to the tank. Which way does the guage read when you disconnect the wire from the tank sending unit? It should go to full scale full if I am not mistaken. You should be able to use an ohm meter and check to make sure you dont have an open in the wire from the gauge to the tank. I wonder if any of the guys would know the resistance range on the tank unit if they did you could buy a resistor and slave it in and see if your gauge reads anything.
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
a guy on here wrote this up a while back about fixing the gauge budget style. like dmayhew suggested, yes it will work.
http://forums.corvetteforum.com/show....php?t=1631101
http://forums.corvetteforum.com/show....php?t=1631101
Drifting
Joined: Aug 2007
Posts: 1,924
Likes: 6
I looked my 77 print and the fuel guage sender in the tank should not have voltage it is a variable resistor. You should have 12 volts to one side of your gauge and the other side of the guage runs to the tank. Which way does the guage read when you disconnect the wire from the tank sending unit? It should go to full scale full if I am not mistaken. You should be able to use an ohm meter and check to make sure you dont have an open in the wire from the gauge to the tank. I wonder if any of the guys would know the resistance range on the tank unit if they did you could buy a resistor and slave it in and see if your gauge reads anything.
DO NOT SHOOT 12 VOLTS THROUGH THE SENDING UNIT!
(boom)
volts to the gauge
ohms (resistance) from the sending unit
