1990 Mazda Protege LX, AutomaticFACTORY OEM SERVICE PROCEDURE

Transfer Pump (Protege 4WD Only)

Because of the rear drive shaft, the fuel tank is in two sections. A transfer pump keeps both sides of tank at equal fuel levels. An access panel is located under the rear seat. Transfer pump control unit is located under driver's seat. Disconnect the transfer pump connector at the fuel tank, and check continuity between (Black/White wire) and (Yellow wire). If no continuity is present, replace transfer pump.

Fig 1: Testing Transfer Pump Control System
G90I04380Courtesy of MAZDA MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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