Controlling the power supply to the fuel pump according to demand, is critical for modern fuel delivery systems, and that task falls on the shoulders of your fuel pump relay. This relay works as a type of on and off switch that only sends power to the fuel pump when necessary, so it helps in saving energy and preventing burnout of the pump. Working with the pump, most fuel-injected engines should achieve a nominal pressure of 40 to 60 psi on a typical 12-volt electrical system when the relay is up and running as well.
If the fuel pump relay is faulty, it is possible for the pump not to receive power and therefore unable to deliver fuel intermittently. When the engine receives bad gas, it operates in an inconsistent fashion so you might experience low rpm or high rpms at idle, then face sputtering engines and a hard start that makes stalling at worst case scenarios can lead. An ailing relay is more than capable of cutting fuel pressure by 10 to 15 percent, which can have an outsize impact on your air-fuel mixture and engine efficiency. Relays solve this issue by ensuring the pump only turns on when needed, stabilizing fuel flow.
Fuel Pump Relays: Important for Safety When the engine is shut down, the relay cuts off power to the pump which minimizes any fuel leaks or dangers in case of an accident. For some late model cars, relays are intended to shut off automatically after a collision and the fuel thereby stops flowing too, which minimizes fire hazard. Vehicles with electric fuel pumps use a relay to prevent the dangers of a failed pump and this is one reason it's so important to make sure your relay is working in cars like our Challenger.
As automotive icon Carroll Shelby once noted, “The quicker you are dead, the longer you must be good,” or : The cleaner your machine — ________ it.Unreliable. A good Fuel Pump relay not only helps to prolong the pump's useful life by lessening unnecessary work, but it also significantly enhances car handling and protection. Professionally inspect and replace defective relays in a timely manner, will help you vehicle in reliable efficient Fuel system performance where engine gets constant fuel supply under any condition.