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Old 10-01-2011, 06:12 PM
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Fuel sending unit

i know this isnt hot rod related but it has to do with my current project im working on, im trying to find the STOCK ohms for the sending unit in the diesel tank, i just put 2 new side saddle tanks on and the sending unit provided doesn't read the way the original does. After taking readings on the original i came up with 140.+ Ohms resistance i dont remember the smaller #, the new sending unit has a resistance of 93Ohms on the high side and almost 0 on the low which would explain why the fuel gauge only read to half a tank even though the float is all the way up. so my train of thought leads me to believe that i need a higher resistance sending unit to get proper readings, does this sound like reasonable thinking?
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Last edited by UPandComing; 10-01-2011 at 06:26 PM.
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Old 10-01-2011, 07:24 PM
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The sender ohms need to match the gauge ohms. The guage may be marked. However it looks like a newer truck and the guage could be electronic and I don't know if they would be the same. Anyway I would try getting a sender for that specific truck manufacturer.
Do a search on here and you should find some info. I know you could try to add resistors to ground in different combinations but might not be perfect. Luck.
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Old 10-01-2011, 07:31 PM
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thanks bob ill take that in mind and it is a 2003 so more than likely an electronic gauge,i would have posted somewhere else but i like this family more
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Old 10-02-2011, 11:04 AM
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I would connect an OBD-II tool to the truck and find out what gauge reading is being calculated by the computer. Its possible that the sending unit and computer reading are fine, and the problem is in the stepper motor for the gauge.

Some of the GM electronic clusters use gauge stepper motors that fail (My 2005 Mustang has the same setup). When they fail they don't zero properly and they can't show the correct reading from the computer. There is a guy on eBay that sells replacement GM and Ford stepper motors. They are relatively easy to replace if you have some basic soldering skills, and the motors themselves are under $10.

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