Fuel Pump Relay
The fuel pump relay switches power to the electric fuel pump when commanded by the engine control unit.
What is Fuel Pump Relay?
The pump usually runs for a few seconds at ignition on to build pressure. A failed relay is a common cause of crank-no-start problems. On many modern cars a fuel pump control module replaces the simple relay. Swapping with an identical relay is a quick test.
How it works
A small control current energises the relay coil, which closes contacts that carry the higher pump current.
Why it matters for your car
Listen for the pump priming for a few seconds when the ignition is switched on. Check the fuse and the immobiliser status before replacing the relay.
Other terms
- Battery Module
- Boost Pressure
- Clear Coat
- ECU (Engine Control Unit)
- Engine Speed (Rpm)
- Hazard Warning Lights
- High-pressure Fuel Pump
- Induction Heater
- Injector Coding
- LED Headlight
- Metric Horsepower (PS, CV, HP)
- Odometer Fraud (Clocking)
- Open Differential
- Oxygen Sensor (Lambda Sensor)
- Rim Width
- Rotary Engine (Wankel Engine)
- Torque
- Towing Mirrors (Extension Mirrors)
- Voltage Regulator
- Wiring Diagram (Circuit Diagram)