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Old 12-04-2010, 02:37 PM
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52 Chevy Truck Fuel Guage

Looking for some help, I have stock guages in my 52 Chevy Truck and I'm looking at buying a new fuel tank for under the bed of the truck. So I can get the fuel out of the cab. But the new fuel sending units ask for ohm when full and when empty. How can I get this from my old stock guages? so I can get the correct sending unit. Thanks for any help with this.

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Old 12-04-2010, 03:08 PM
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With a digital ohmmeter, measure the resistance at the FULL position of the float and at EMPTY position of the old fuel level sending unit.
This should enable you to choose a new sending unit that will work with the old gauge.

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Old 12-05-2010, 09:24 AM
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should be 0 to 30
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Old 12-05-2010, 10:03 AM
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I found this, "Your original fuel tank sender unit will work on 6v. or 12v. The OHM reading from the sender in the tank should be (0-30 ohms). If you are using fuel gauge on a 12v. system you will need a voltage reducer on the back of fuel gauge power side." So I guess I need a voltage reducer, if I'm using the stock guages. Now to find a reducer if this is what I need.
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Old 12-05-2010, 02:07 PM
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If your fuel gauge now works and the truck has been converted to 12 volts a voltage converter is already installed.
If you don't know if the gauge works it can be tested using a 30 ohm resister in series with a 6 volt source. This should read EMPTY. With the gauge connected to full 6 volts the gauge should read FULL.
This is assuming that the tank sender is 0 (full)-30 (empty) ohms.
When selecting a voltage reducer be sure to get one designed for gauges. The other type are for motors and heavy loads.
See www.speedwaymotors.com

vicrod
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