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  1. 11-09-2009, 08:42 PM #1
    Mrcrowley
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    Default What would cause my fuel gauge to read empty when it is full?

    2001 Chevy Silverado 3500 1 ton dump
    Duel tanks one relay for pumps both tanks have FSU .
    What I have done :
    I have problem with the second tank pump not pumping for some reason. I know this because ran out of gas at half full on the fuel gauge.AND I went to fill tank and second tank was full to test theory I ran truck for 100 miles and fill primary tank and the second tank would not take any fuel it was full.
    I have tested grounds for sensors and for the pumps all are fine.I ran test leads to the second tank for the fuel pump and it ran . The second tank feeds the primary tank through the over fill hose on primary tank.Both pump leads on primary and second tank are at @5.88 volts when key was on accessory but did not change when I cranked it over.This truck only has one relay for fuel pumps according to parts dept at Chevy dealership so I am assuming the pumps run at same time even flow type system.What would be the correct way to test the sensors on each tank? I have have fluke volt and ohm meter just need to know the correct readings for each sensor?
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  2. 01-23-2010, 02:49 PM #2
    roger97338
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    Blown fuse. Broken sending unit. Fuel siphoning bandit. Looking at your gauge cross-eyed. All are possible causes.
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  3. 01-24-2010, 09:37 AM #3
    Chevyboy96
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    Default

    Quote Originally Posted by roger97338 View Post
    Blown fuse. Broken sending unit. Fuel siphoning bandit. Looking at your gauge cross-eyed. All are possible causes.

    '96 K1500, 5.7
    6" RCD
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  4. 02-18-2010, 12:51 AM #4
    05bluebeauty
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    fuel pump also might be bad, had the same thing in my s10 back in the day and replaced it and it was back to normal
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  5. 02-18-2010, 02:31 AM #5
    J_chevyman
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    Default re

    Fuel pump...same deal with my 2001
    Joser
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  6. 02-18-2010, 08:52 PM #6
    ADrooster
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    its most likely a sending unit
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