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Old 01-05-2019, 04:04 PM   #1
bonnie&clyde
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Default Fuel gauge issue

92 ford mustang with a auto meter mechanical fuel gauge, the issue is the gauge reads past the full line, the gauge is not a vertical gauge but a horizontal (dont know if that matters or not). Issue is ever since i got the car the gauge just flies all the way to the right waaaaay past the full marker and stays there, even when i know the tank is not full, i do see it move up and down a slight bit when i turn on the car but not anywhere it should be. I thought it was a grounding issue so i verified the grounding and even re-wired it (since i have a areomotive fuel system) and nothing. So next thing i just swapped the sending unit inside the tank and went to turn the key and same thing, i see it move but never even close to pass the full marker. Gauge is wired as instructed....and ideas anyone?? Ill try and post a picture of where the needle sits shortly
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Old 01-05-2019, 04:09 PM   #2
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Here is the gauge without the key turned
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Old 01-05-2019, 04:10 PM   #3
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And this is with the key to the on position
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Old 01-06-2019, 07:24 AM   #4
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I hope the link helps. I used to keep extra sending units and window switches
just for buggers like this.

https://www.stangnet.com/mustang-for...ge-wtf.501696/
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Old 01-06-2019, 08:23 AM   #5
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Check your ground to the sending unit.
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Old 01-06-2019, 08:47 AM   #6
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Originally Posted by garycrist View Post
I hope the link helps. I used to keep extra sending units and window switches
just for buggers like this.

https://www.stangnet.com/mustang-for...ge-wtf.501696/
Saw this post last night off the corral but i dont have a anti slosh module, these are all after market gauges and cluster, could that be the issue? Gonna go buy resisters today to see if it could be the gauge but its also brand new
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Old 01-06-2019, 08:47 AM   #7
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Quote:
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Check your ground to the sending unit.
Let me try and find it.
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Old 01-06-2019, 10:51 AM   #8
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Quote:
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Let me try and find it.
PITA, way up in there.. I would suspect loose at frame connection though, so thats easier.
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Old 01-06-2019, 11:22 AM   #9
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PITA, way up in there.. I would suspect loose at frame connection though, so thats easier.
Are you talking about at the dash itself? If so the ground is tapped in with the other gauges too, so if this one had a grounding issue wouldnt they all??
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Old 01-06-2019, 11:24 AM   #10
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Here are the wires i tapped into for the ground and the sending unit
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Old 01-06-2019, 02:20 PM   #11
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Im talking about the sending unit at the tank, it should be grounded. Whether that ground goes straight to chassis or straight to your gauge ground is fine. But the sending unit has to be grounded to work.
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Old 01-06-2019, 02:27 PM   #12
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Down behind the driver's kick-panel, the rear
wiring harness is in a nice place to chop and splice.

I do not remember the color of the sending unit wire but,
that would be a great place to cut and temporarily jump
to your gauge.
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Old 01-06-2019, 05:23 PM   #13
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Are you sure the sending unit is the correct resistance for your gauge?
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Old 01-07-2019, 09:37 AM   #14
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Are you sure the sending unit is the correct resistance for your gauge?
according to LRM
-1987-1997 Mustang Fuel Level Sending Unit Ohm Readings are approximately 22 ohms empty and approximately 145 ohms full.

and from Autometer
16 Ω Empty / 158 Ω Full

still tracing out the grounds.
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Old 01-07-2019, 06:45 PM   #15
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I’d call down to florida5.0 and/or autometer. I’d bet it’s an issue with the sending unit too though. Did it ever work right?
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Old 01-07-2019, 10:14 PM   #16
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Id call down to florida5.0 and/or autometer. Id bet its an issue with the sending unit too though. Did it ever work right?
I looked at the email where i requested the specific ohm gauge and it looks to be the right one, as far as the sending unit, the car sat for over 4 years so i figured it could have been bad, so when i replaced it i was hoping the issue would have been fixed, seeing as i bought this car as a roller im gonna trace down the wires and make sure they are not hacked up
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Old 01-08-2019, 05:24 AM   #17
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I called florida5.0 once or twice when I installed mine. They were pretty helpful. It may be worth the time to give them a shout.
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Old 01-18-2019, 08:06 AM   #18
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Did you get it "HEALED"?
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Old 01-19-2019, 06:20 PM   #19
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Old 01-19-2019, 06:21 PM   #20
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The yellow wire was cut and taped inside the wire look behind the inside trunk panels
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