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Old 07-21-2011
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Bad sending unit?

So i filled up the ranger today. then jumped in like normal and a little down the road i look down and see this.


has this happend to anyone before? Did my Sending Unit just OD?
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Old 07-21-2011
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where would it normally rest on a full tank
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Old 07-21-2011
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about an eighth over full.
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Old 07-21-2011
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Higher gauge reading means higher resistance in the fuel level sender circuit, so a poor connection or open in the sender circuit could send the gauge to the max.

Assuming that high resistance is the cause, I would check the easiest possible problem area first - the bolted ground point under the hood on the driver side inner fender about halfway back. If that's OK, then it is down to troubleshooting the circuit one segment at a time: the Y/W wire from the cluster's Slosh Module back to the sender, the sender itself and the BK/Y wire forward to the underhood ground.

"Empty" sender resistance in a 94 Ranger should be about 22 ohms, "full" around 145 ohms.
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Old 07-21-2011
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Quote:
Originally Posted by rwenzing View Post
Higher gauge reading means higher resistance in the fuel level sender circuit, so a poor connection or open in the sender circuit could send the gauge to the max.

Assuming that high resistance is the cause, I would check the easiest possible problem area first - the bolted ground point under the hood on the driver side inner fender about halfway back. If that's OK, then it is down to troubleshooting the circuit one segment at a time: the Y/W wire from the cluster's Slosh Module back to the sender, the sender itself and the BK/Y wire forward to the underhood ground.

"Empty" sender resistance in a 94 Ranger should be about 22 ohms, "full" around 145 ohms.
Cool. I'll check those things out. I came home and left again, when i left it had gone back to the full line and when i started it up it moved back to that position. but i know that its supposed to do this for some reason or another.
I'll bring my ammeter home with me tomorrow if it doesn't go down.
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