Fuel Level Indication System

Note: The fuel gauge and anti-slosh module are calibrated at the manufacturing facility and both must be replaced if either is damaged.

The fuel level indication system is a magnetic-type indication system, which consists of:
1. Fuel level sensor (located in the fuel tank).
2. Anti-slosh/low fuel level warning module.
3. Fuel gauge (located in the instrument cluster).

FUEL GAUGE

CAUTION: Do not remove magnetic gauge pointers; the gauge cannot be recalibrated.

1. The magnetic fuel gauge consists of four primary coils, one of which is wound at a 90-degree angle to the other three.
2. The coils form a magnetic field which varies in direction according to the variable resistance of the fuel level sensor.
3. A primary magnet, to which a shaft and pointer are attached, rotates to align to this primary field, resulting in pointer position.
4. The bobbin/coil assembly is pressed into a metal housing which has two holes for dial mounting.

The fuel level sensor changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge. The pointer position varies proportionately to the current flow.

The pointer of the magnetic gauge remains in relatively the same position when the ignition is turned to OFF position.

There is no adjustment, calibration, or maintenance required for the fuel gauge.

INSTRUMENT CLUSTER GAUGE AMPLIFIER
The conventional instrument cluster contains an instrument cluster gauge amplifier. The instrument cluster gauge amplifier part of the anti-slosh/low fuel level warning module provides a delay to the fuel gauge to prevent the fuel gauge pointer from fluctuating as a result of excessive movement in the fuel tank.

LOW FUEL LEVEL WARNING
The anti-slosh/low fuel level warning module has additional circuitry to turn on a LOW FUEL warning indicator when the fuel gauge shows approximately 1/16 tank of fuel remaining.

ANTI-SLOSH/LOW FUEL LEVEL WARNING MODULE






1. The anti-slosh/low fuel level warning module is designed to prove out the LOW FUEL warning indicator. The anti-slosh/low fuel level warning module is a small printed circuit board which latches into a pocket on the back of the instrument cluster.
2. The electrical connections for ignition, ground, input from fuel sender, output to fuel gauge, and low fuel warning output (where equipped) are made through a spring-type connector on the anti-slosh/low fuel level warning module to the instrument cluster printed circuit on the instrument cluster.
3. There are no provisions for calibration or adjustment of the anti-slosh/low fuel level warning module.

FUEL LEVEL SENSOR
1. The fuel pump module and pump assembly consists of a variable resistor controlled by the level of an attached float in the fuel tank.
2. When the fuel level is low, resistance in the fuel pump module is low and movement of the fuel gauge indicator dial is minimal (from EMPTY position).
3. When the fuel level is high, the resistance in the fuel pump module is high and gauge indicator dial movement is greater (further from the EMPTY position).