Fuel Gauge

The fuel gauge pointer is moved by the following coils:
^ The E coil
^ The F coil

The 2 coils are oriented at right angles so that the magnetic fields interfere with each other. Battery voltage is available from the GAUGES Fuse 4 through the CKT 39 (PNK) wire to the instrument cluster when the ignition switch is in the RUN or START position. Current flows through the E coil which places the pointer at E (empty) if there is little current through the F coil. If the current through the F coil is high, then the pointer moves toward the F (full) indication.

The current that passes through the E coil has 2 paths to ground. Some of the current can pass through the fixed resistance of the F coil and to Ground G101 through the CKT 451 (BLK/WHT) wire. The rest of the current will go to ground through the variable resistance of the fuel sender element and the fuel sender buffer module. The fuel sender element in the fuel pump and fuel sender produces a resistance of approximately 4 Ohm when the fuel tank is empty. With this low resistance, most of the current passes through the fuel sender and not the F coil. If the tank is full, then the resistance of the fuel sender is approximately 90 ohm. With this high resistance, more current flows through the F coil and the pointer moves to E.

The accuracy of the fuel gauge is adequate for normal operator usage. The fuel gauge provides a reasonably accurate indication of the level in the fuel tank. The fuel sender buffer module is used for anti - sloshing in order to increase the accuracy of the fuel gauge. The gauge accuracy is not affected by changes in the battery voltage. The accuracy of the fuel gauge can be influenced by the non - linear construction of the fuel tank.