How Does a Fuel Relay Work

The fuel pump relay is activated long enough to supply the current required to turn on the fuel pump. … At this point, the electricity for the fuel pump is supplied by the oil pressure sending unit. When you shut off the ignition, the fuel pump relay is engaged again, long enough to power down and shut off the fuel pump.

How do I know if my fuel relay is bad?

1. Check Engine Light (CEL) Illuminated. In most cases, the primary symptom is a check engine light. …
2. High Mileage. …
3. Long Starting Time. …
4. Engine Performance Issues – Stalling, Idling, Acceleration, Not Starting. …
5. Car dies while driving. …
6. Silent Fuel Pump Noise.

What happens when fuel relay goes bad?

Because y our vehicle’s fuel pump relay is a vital component that prompts your fuel pump to start once you fire your engine. It is prone to wear and tear that could cause it to get damaged like all devices. Once the fuel pump relay goes bad, the fuel supply to the engine is cut off, and your engine stalls.