Fuel pump relays are important elements in modern cars as they control the power going to the fuel pump ensuring steady and safe operation. Relays, which serve as switches to allow the fuel pump to take power from the battery, do not need to have high-current wires run through the ignition switch. This arrangement maintains electrical efficiency, with the relay passing electricity directly through to the pump while only pulling a minimal load through the ignition circuit. Relays help with the fuel pump by reducing electrical resistance for improved efficiency for the fuel pump operation, steady fuel pressure and consistent performance, particularly during start up.
Because many fuel pumps need 12 volts to function properlyso the relay maintains the deliver 12 volts to the pump. If the voltage varies, the fuel will be inconsistent, resulting in a rough idle, misfire, or even stalling of the engine. These shortcomings can be avoided if the fuel pump relays provide the appropriate amount of current to the fuel pump at any given time and thus directly influence the performance and reliability of the engine.
Another safety feature of being a fuel pump relay is that it can stop feeding fuel in some situations. For instance, during a crash, the relay cuts power to the fuel pump so the fuel can stop flowing, minimizing the chance of a fire. Most cars these days come with basic safety features out of the box, and relays must be one of the first structures for your safety in the face of emergencies. This function is a regulatory requirement stipulated in automobile safety standards (e.g. NHTSA) highlighting the safety pivotal role of this relay.
Though relays can handle high current for long durations, they have a finite life rated at somewhere between 100,000 to 150,000 miles. Regular inspection ensures that the relay is working fine or else a failing relay may cause intermittent power loss, so the fuel pump may not be activating and you may end up losing engine power. Even just a basic relay will help ensure a consistent supply of the useable fuel required from the fuel system, as automotive expert Ed China (right) puts it.
A good quality Fuel Pump with a reliable relay system ensures consistent fuel flow which protects both performance and safety.