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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

fuel gauge reading backwards

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Old Feb 9, 2014 | 01:34 PM
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mikekin1
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Question fuel gauge reading backwards

Ok heres something new, replace sending unit in my truck now it only registers to 1/2 tank, when i fill the tank the gauge reads empty, as fuel runs low is reads backwards ( new sending unit from LMC , front tank 19 gal.) Any suggestions?
 
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Old Feb 9, 2014 | 02:10 PM
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Wrong year of sender.
I forget the exact year, but they reversed the ohms from full to empty.
 
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Old Feb 9, 2014 | 02:16 PM
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Either the wrong sender or it's wired wrong. I did this by accident on a 1992 Dakota.
 
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Old Feb 9, 2014 | 02:20 PM
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plug and play sender, sender looks exactly like what was pulled out except the new one has all the tubes in place (not rotted off) ordered for 86-92 f250
 
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Old Feb 9, 2014 | 02:20 PM
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Wiring 'wrong' wouldn't change the ohms to ground.
The gauge is reading backwards because the wrong one was ordered or LMC is sending the wrong stuff in the right box, again.
 
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Old Feb 9, 2014 | 02:27 PM
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FWIW;
Originally Posted by 81-F-150-Explorer
I would say your sending unit is the culprit, and they gave you the wrong one for your application.

1980-1986 sending units should read between 80-10 ohms resistance. 10 Ohms being Full, 80 ohms being empty.

1987-Up sending units read the exact opposite. 165 ohms full, 10 ohms empty.

No the later 1987-up gauges are different.
<extra letters for the forum>
 
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