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Fuel sending unit resistance - How to measure?
#776810
08/18/10 05:25 PM
08/18/10 05:25 PM
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Joined: May 2003
Posts: 8,430
St Charles MO
70Coronet500Vert
OP
master
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OP
master
Joined: May 2003
Posts: 8,430
St Charles MO
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I measured from the post on the unit to the bare metal of the unit and got very high readings.
I also measured from the terminals on the back of the autometer gauge, through the wires to the unit and got very high readings.
The readings were "backwards" meaning I had a lower resistance at empty than at full. Th book says I should have a lower reading at full than empty.
The values were in the 790Kohm range to an open circuit range when full.
Supposed to be 33ohms empty and 8ohms or so full.
No matter how responsible he may seem, never give your gun to a monkey!
1970 Coronet Vert
1972 Charger
1974 Satellite Sebring Plus Sundance
2001 Ram 4x4
2002 Intrepid
2006 300C
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Re: Fuel sending unit resistance - How to measure?
[Re: 70Coronet500Vert]
#776812
08/18/10 08:28 PM
08/18/10 08:28 PM
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Joined: Mar 2003
Posts: 571
Beaverton, OR, USA
Alikazam
super gas
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super gas
Joined: Mar 2003
Posts: 571
Beaverton, OR, USA
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Quote:
I measured from the post on the unit to the bare metal of the unit and got very high readings.
I also measured from the terminals on the back of the autometer gauge, through the wires to the unit and got very high readings.
The readings were "backwards" meaning I had a lower resistance at empty than at full. Th book says I should have a lower reading at full than empty.
The values were in the 790Kohm range to an open circuit range when full.
Supposed to be 33ohms empty and 8ohms or so full.
I assume you are using a stock fuel level sender with an autometer gauge designed for that range? Just making sure! 
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Re: Fuel sending unit resistance - How to measure?
[Re: Alikazam]
#776813
08/19/10 08:25 AM
08/19/10 08:25 AM
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Joined: May 2003
Posts: 8,430
St Charles MO
70Coronet500Vert
OP
master
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OP
master
Joined: May 2003
Posts: 8,430
St Charles MO
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Actually the autometer gauge in the car is wrong for a stock sender. It is a 2320. I think it is supposed to be a 2315. however, it is wired correctly and not measuring anything, so I wanted to verify the resistance of the circuit.
I think the sender, aftermarket or stock, is bad. The 2320 takes a 3625 sender or something. Not stock.
No matter how responsible he may seem, never give your gun to a monkey!
1970 Coronet Vert
1972 Charger
1974 Satellite Sebring Plus Sundance
2001 Ram 4x4
2002 Intrepid
2006 300C
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Re: Fuel sending unit resistance - How to measure?
[Re: NachoRT74]
#776815
08/19/10 03:42 PM
08/19/10 03:42 PM
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Joined: Oct 2007
Posts: 3,908
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,908
Oregon
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try adding another ground from the swinging arm to the rest of the filler body, then check the resistance measurements again. (A simple wire with alligator clips would be fine for testing)
If you ever find yourself in a fair fight, your tactics suck.
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