S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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Unclip 4-pin connector and disconnect.
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Measure resistance at both terminals -2- and -3- at fuel pump flange
If the fuel tank contains fuel, the measured
value must be between the specified values for full and empty.
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If you measure 0 Ohms (continuity) or Infinity Ohms (no continuity), check for open circuit inside the tank or for short circuit.
NOTE: To check resistance for "tank full" or "tank empty" you must move the float for fuel gauge sender to upper or lower stop.