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84 Sending unit issue

brimis

Member
Joined
Sep 23, 2006
Messages
17
Location
NJ
Corvette
1984 Stock 171,000 miles
The gas gauge in my 84 started giving false readings, so I removed the sending unit and placed it on the workbench. As I moved the float resistance flucated between 0 ohms and 95 ohms. I then removed the sending unit cover and cleaned the contact and windings. I received the same readings as before.

I reinstalled the unit along with a new fuel gasket and now I get no reading at the gas gauge. I disconnected the 3 prong connector at the tank and measured across pins 1 and 3 and get a reading of 2 ohms, an empty tank. The gauge was rearding reserve, 1/4 or 3/4 when the tank is at about 3/4 full before I removed the sending unit.

Could the float have gotten hung when I reinstalled it? Could the float be saturated?

Thank you
 
1

1984C4

Guest
http://misterbill.homeip.net/vette/wiring/instrument cluster inputs_outputs.jpg

http://misterbill.homeip.net/vette/wiring/grounds1.jpg

Hi, Not sure if this will help, but the first link shows the circuit.The ecm sends a voltage to the sending unit which is a variable resistor as you know, to ground. The ground (Ground 109) on the second link is located above the right wheel well. Since you did not get any resistace change after cleaning the sending unit, I would look at that ground. It may have some high resistance from corrossion that was causing the errratic and now, no operation. Good luck. Mike
 

brimis

Member
Joined
Sep 23, 2006
Messages
17
Location
NJ
Corvette
1984 Stock 171,000 miles
http://misterbill.homeip.net/vette/wiring/instrument cluster inputs_outputs.jpg

http://misterbill.homeip.net/vette/wiring/grounds1.jpg

Hi, Not sure if this will help, but the first link shows the circuit.The ecm sends a voltage to the sending unit which is a variable resistor as you know, to ground. The ground (Ground 109) on the second link is located above the right wheel well. Since you did not get any resistace change after cleaning the sending unit, I would look at that ground. It may have some high resistance from corrossion that was causing the errratic and now, no operation. Good luck. Mike

I'll check it now,
Thank you kindly
 

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