05/06/07, 10:10 PM
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Join Date: Dec 2002
Location: East TN
Posts: 6,977
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Quote:
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Originally Posted by Jim&Chele
i have a 84 chevy with dual(saddle) tanks.I switched from 1 tank to the other a few days ago and now my gauge needle is WAY past full.I have ran fuel hose from the drivers side tank lines to the lines going to the fuel pump.I unplugged the wires on the switch as well as the wires on the valve,for lack of better words,where the fuels hook to and still the gauge is way past full with the key on.With the key off it slowly moves to F and thats it.So is my problem in the sending unit(s)?
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Sounds like your problem is most likely in the switching valve mechanism. The valve under the truck switches the lines and also switches the electrical connection for the sending unit. Gas gauges on GM vehicles work by the sending unit being a variable resistor to ground. If the circuit goes open, infinite ohms, it goes to full or past full. If the circuit goes grounded or 0 ohms it goes to empty.
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