20 ELECTRICALS 9. FUEL GAUGE TANK UNIT Removal : l Remove Fuel Tank assembly. Fig. 12 l Release clip & disconnect fuel feed hose. l Release clip & disconnect fuel return hose. l Remove electrical connections. l Remove 6 nuts securing Float Unit from the fuel tank. l Remove seal from the Float Unit. Fitment : Please follow reverse procedure Testing / Checking : Fig. 13 The sender is a float operated rotary potentiometer which provides a variable resistance to ground for the output from the gauge. When the sender float is at its lowest point, indicating an empty fuel tank, the resistance to earth is at its lowest. The resistance is sensed by the gauge which positions the needle accordingly. Use ohm-meter to confirm that the resistance of the fuel level sensor (Fuel Tank Unit) changes with the level of float position. Temp. Gauge : Refer Fig. 9 When the engine reaches normal operat ing temperature, the gauge will rest at the mid-point of the temperature scale. If the engine coolant temperature becomes too high, the pointer will rise to the red segment of the scale to warn of an engine cooling fault. At this position the engine coolant temperature is too high and continued operation could result in engine damage; the vehicle should be stopped as soon as possible. Fig. 12 Fig. 13 Calibration Details : Float Position Empty Half Full Float Height 16.5+2 133+2 262+2 Resistance 10 104 186 1N OHMS Tolerance +0 +8 +8 in OHMS -4 15.00 DETAIL ‘A’ SCALE N S B 75.00 M4.00 X0.7 B T (90.00) 37.50 4.00 169.00 Fuel Tank Unit R176.00+2 HALF EMPTY RESERVE FULL
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