1999 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

Fuel Pump

FUEL PUMP PERFORMANCE

Application (1) Pressure psi (kg/cm2 )
ES300, GS300, GS400, LS400, RX300, SC300 & SC400 44-50 (3.1-3.5)
LX470 38-44 (2.7-3.1)
(1) Check fuel pressure with engine off and using scan tool connected to data link connector No. 3 with ignition on to activate fuel pump or by connecting battery voltage to terminals on electric fuel pump.
REGULATED FUEL PRESSURE

Application At Idle W/Vacuum psi (kg/cm2 ) At Idle W/O Vacuum psi (kg/cm2 )
ES300, GS300, GS400, LS400, RX300, SC300 & SC400 (1) (1)
LX470 28-34 (2.0-2.4) 38-44 (2.7-3.1)
(1) Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ) with engine idling. Fuel pressure regulator is not vacuum controlled, as fuel pressure regulator is mounted on electric fuel pump in the fuel tank.
FUEL PUMP RESISTANCE

Application Ohms @ 68°F (20°C)
All Models .2-3.0
Factory Service Tools

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When to See a Mechanic

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

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

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