Remove the fuel pump relay, which is a cube-shaped object that connects with prongs like an electrical plug. Disconnect the plug-in (and fuse, if needed) to the relay to remove it. If the relay is within the box, pry it out carefully with the help of a flathead screwdriver.

how long does a fuel pump relay last? Over time, the fuel pump relay can begin to show signs of wear and will have to be replaced. The fuel pump relay is designed to last the life of the car, but due to the grueling conditions it is exposed to, it will not usually last that long.

Simply so, is it the fuel pump or the relay?

The main relay is basically a switch that turns the fuel pump on. If the relay fails, the fuel pump wont turn on and there wont be any fuel pressure to check. If the relay is good and fuel pump is bad, then there will be no fuel pressure to check either. Of the two, the relay is much easier to get to.

Can a bad fuel pump relay drain battery?

If the relay has an internal short it may keep power fed to the ignition and fuel system, even when ignition cylinder is in another position, or the key is removed. This will cause the fuel pump and ignition components to remain powered on, drawing current, at all times, which will eventually lead to a dead battery.