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1964 FUEL GAUGE TROUBLES

These mini-techs are being taken from GM's Chevrolet Service News. The Service News publication was provided by GM each month to its service departments. Each month this publication covered persistent problems that service departments might be facing, and provided information on how to fix the problem.

These Chevrolet Service News publications by no means covered all the problems a service department faced with the introduction of each new years models. Likewise our seven mini-techs will by no means answer all the problems.

Your best source for information on repairs and restoration are the Shop Manuals and Assembly Manuals for your year Chevy without these publications you will be working in the dark!


1964 FUEL GAUGE TROUBLES

The following checks of the fuel gauge circuit are designed to permit technicians to quickly determine whether an incorrect fuel gauge reading is actually the result of an improperly operating gauge or whether the fuel tank mounted sending unit or the circuit wiring is the trouble source.

    ERRATIC FUEL GAUGE READINGS
    Inspect all circuit wiring for damage to insulation and conductor, also carefully check to assure good electrical conneciotns are provided at the following locaitons:
  1. Ground connections at dash unit mounting.
  2. Harness connector to dash unit.
  3. Body harness connector to chasssi harness,
  4. Ground connection from tank unit to trunk floor pan
  5. Feed wire connection at tank unit

    GAUGE ALWAYS READS FULL
    (With Ignition Switch On)
  1. Check for proper elecrtical connections at the dash unit also at the body harness connector to chassis harness connector
  2. Check ground wire from tank to trunk floor pan for continuity
  3. Connect a spare tank unit to the tank feed wire and the ground lead. Raise and lower float arm observing dash unit. If dash unit follows arm movement, replace tank unit.

GAUGE ALWAYS READS EMPTY
(With Ignition Switch On)

Disconnect tank unit feed wire and do not allow wire terminal to ground. Dash unit should now read full.

    Gauge Reads Empty
  1. Remotely connect a spare dash unit into the dash unit harness connector and provide ground for unit. If full reading shown, dash unit shorted. Replace
  2. If still reads empty, short in harness between tank unitand dash unit.

 

    Gauge Now Reads Full
  1. Connect a spare tank until tank feed wire and the ground lead.
  2. Raise and lower float arm while observing dash unit. If dash unit follows arm movement, replace tank unit

GAUGE NEEDLE NEVER REACHES FULL MARK
Disconnect feed wire to tank unit and connect the wire to ground thru a variable resistor in shop test equipment or thru a spare tank unit. The dash unit should read full when resistance is increased to approximately 29 to 32 ohms (equivalent to fully raised float on tank unit). If the above check shows the dash unit to be operating properly, then the trouble is either that the tank unit rheostat is shorted or the float arm is bent, or the tank itself may even be deformed. Inspect and correct as necessary.

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