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Old 11-02-2019, 03:33 PM   #143
TBONE1964
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Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
Re: 67-72 Chevy Truck fuel gauge diagnostics 101

This photo shows the voltage in the sender line. Because of resistance, you will never see 12 volts here. The photo shows 6.63 volts at full tank and will show about 1 volt when at 1/4 tank or so. Voltage drops with float movement.
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