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  1. #1

    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?

  2. #2


    Blown fuse. Broken sending unit. Fuel siphoning bandit. Looking at your gauge cross-eyed. All are possible causes.

  3. #3


    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
    35" Toyo M/T On 16" Black Raceline Raptors
    4.56 Yukon Gears w/ TruTrac Rear
    S&B CAI
    Dual Flowmaster 40's
    Camo Wet Okoles
    Line-X Bedliner

    NW BlackDiamond Edition

  4. #4


    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

  5. #5

    Default re

    Fuel pump...same deal with my 2001
    2001 Silverado 5.3L
    13% tint all around
    7" Fabtech lift kit w/ leveling kit
    HD front end conversion
    Blacked out Billet Grille w/ Black Bow-Tie
    33x12.5x20 on 20x10 Fuel Hostage
    Smoked out tail lights
    Dual Flow Masters/ Exhaust Cut outs
    K&N CAI
    Custom Tuner
    Corvette Servo
    180 Stat
    10K HIDs

    "Spending money on things we dont need to impress people we dont know"

  6. #6


    its most likely a sending unit

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