This is by far the most likely symptom of a faulty fuel pump relay, but it’s also one of the most overlooked. If they do, then it’s worth investigating a little bit further. Signs of a Faulty Fuel Pump Relayīefore you head out and start swapping relays and ordering new parts, check to see if any of these symptoms match up. If your vehicle doesn’t have a diagram on the fuse box, you’ll need to do some research online to try and determine which relay is the fuel pump relay. The fuel pump relay won’t have any flashing bright lights telling you what it is, but if you’re lucky, the underside of the fuse box will have a diagram that breaks down what each relay and fuse is. Once you take the cover off, you’re bound to see a few different relays and fuses. The fuse box has a cover, and you’ll need to take it off to find the fuel pump relay. No matter where your fuel pump relay is, you’re looking for the fuse box. Underneath the dash on the passenger side of your vehicle.Underneath the hood of your vehicle by the firewall or.While the exact position of the fuel pump relay can vary depending on what you drive, there are two common locations you should check. That natural position for the fuel pump is off, which is a good thing otherwise you’d constantly run out of fuel! The fuel pump relay is the gateway between the ECM and the fuel pump, and because of this, it’s a pretty important component! Fuel Pump Relay Location When it doesn’t, it switches off and the fuel pump shuts down.

When the relay gets enough power, it switches over and sends that power to the fuel pump. The ECM does this by controlling a relay, the fuel pump relay.

One thing that’s happening is that your vehicle’s ECM is sending a signal to the fuel pump to put the right amount of fuel into the combustion chamber to start your engine.

When you turn the key, there’s more going on than you likely realize.

2005 expedition fuel pump symptoms