Testing fuel sending unit
#1869862
07/14/15 12:23 AM
07/14/15 12:23 AM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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The gauge does not register. Just bought the car and the owner replaced the sending unit a couple of years ago and said it was working recently. Before pulling stuff I need some reminders of how to start troubleshooting. It's been a few years since doing this and I'm not remembering all the steps.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Testing fuel sending unit
[Re: dfsmopars]
#1869993
07/14/15 08:31 AM
07/14/15 08:31 AM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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the sending unit should read from 15-85 ohms depending on how full empty the tank is.
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: Testing fuel sending unit
[Re: dfsmopars]
#1870803
07/15/15 09:23 AM
07/15/15 09:23 AM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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Pulled the wire and got 86 ohms. So I guess that means the sender is at least working. How accurately it is working remains to be seen. So next I am going to check if there continuity along the wire from the terminal to the gauge. If that is OK how do I check the gauge without doing it harm?
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Testing fuel sending unit
[Re: dfsmopars]
#1870870
07/15/15 01:06 PM
07/15/15 01:06 PM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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Grounded out the terminal back at the tank and the gauge went to full. I am assuming the gauge is good. So, if there is 86 ohms at the sender, the wire is good, the gauge goes to full when grounded and yet the gauge doesn't register with the terminal connected to the sender that is grounded where is the problem?
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Testing fuel sending unit
[Re: tman]
#1870917
07/15/15 02:37 PM
07/15/15 02:37 PM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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No but I was grounding it other ways to test it to no avail. I have now gotten the unit out of the tank and it is a bit crusty. It's not original but it is without a float, screen and was stuck in one position. With a good ground I can get it to move the gauge now that it is no longer stuck and it looks accurate. Looks like a replacement unit and new ground strap is in order. It is good to have helpful friends. Thanks to all.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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