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Home >> Ford >> 1988 >> Taurus MT5 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard >> Testing >> Fuel Indicating System - Fuel Sender Unit >> In Vehicle Test

In Vehicle Test

  1. Inspect fuel tank for distortion or damage. If fuel tank is distorted or damaged, it must be serviced or replaced before further testing. See procedures in Bench Test below if fuel sender is removed from fuel tank.
  2. Connect one lead of Rotunda Digital Volt Ohm Meter 007-00001 or equivalent to ground terminal of fuel sender connector, the other lead to variable resistor terminal. Follow manufacturers connector application on the tester. Ohmmeter reading should be between 15 and 160 ohms. Replace fuel sender if fuel sender resistance is above 160 ohms or below 15 ohms.
  3. Fill fuel tank to capacity. Ohmmeter should read between 145 and 160 ohms. If FULL fuel tank fuel sender resistance reading is below 145 ohms or above 160 ohms, fuel sender unit must be replaced.
  4. Use Rotunda Gasoline Tanker 034-00002 and Adapter Hose 034-00011 or equivalent. Then, drain all fuel from fuel tank observing ohmmeter reading while fuel tank is being drained. Resistance should increase smoothly without jumping or hesitating. If resistance reading jumps or hesitates, replace fuel sender unit.
  5. When fuel tank is empty, the ohmmeter reading should be between 15 and 22 ohms resistance. If EMPTY tank's fuel sender resistance reading is below 15 ohms or above 22 ohms, replace fuel sender unit.
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