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.
2011 Hyundai Equus SignatureFACTORY OEM SERVICE PROCEDURE
Description and Operation: Description
Fuel pump resistor controls supply voltage for the fuel pump motor.
This resistor reduces noise and increases durability of the fuel pump motor through reducing rpm and flow quantity at specific range.
FUEL PUMP MOTOR OPERATION REFERENCE CHART
| Engine state | Resistor | Mode | Supply voltage (V) |
|---|---|---|---|
| Engine start | Not operated | Hi mode | Battery voltage |
| Idle ~ Specific range | Operated | Lo mode | About 9.5 |
| W.O.T or Rapid acceleration | Not operated | Hi mode | Battery voltage |
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.