Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1992 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Fuel Pump
NOTE:
Fuel pump performance measures fuel pressure and volume availability, not regulated fuel pressure.
FUEL PUMP PERFORMANCE
| Application | Pressure psi (kg/cm2 ) | Min. Vol. In 30 Sec. Pts. (L) | ||
|---|---|---|---|---|
| All Models | 38-44 (2.7-3.1) | (1) | ||
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REGULATED FUEL PRESSURE
| Application | At Idle W/Vacuum psi (kg/cm2 ) | At Idle W/O Vacuum psi (kg/cm2 ) |
|---|---|---|
| ES300 | 33-37 (2.3-2.6) | 38-44 (2.7-3.1) |
| All Others | 28-34 (2.0-2.4) | 38-44 (2.7-3.1) |
Factory Service Tools
Use the Manual With the Right Hardware
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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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