The first step to jumping a fuel pump relay is parking your car on flat ground. Turn on the ignition key. Note that you will not start the car engine, only the ignition key.
It will determine what will be your next step.
When jumping into a fuel pump relay, it’s important to know the diagram of the relay center. You can find it in the engine compartment, which looks like a black plastic box.
If you still can’t see it, use the car’s manual or ask your electrician.
How A Fuel Pump Relay Works
Steps in Jumping A Fuel Pump Relay
- Park your car on flat ground.
- Start the ignition key. Don’t start the car’s engine, only the ignition key.
- Open the hood and find the relay center.
- Disconnect the battery’s negative cable if you hear a sound after starting the ignition key.
- Remove the fuel pump relay only when the electricity is turned off.
- Using a wire stripper, remove about 1/2 inch of insulation from both ends of a small-diameter copper wire.
- Shove in one end of the copper on the upper left side and the other on the lower right side of the 4-pin receptacle in the relay center.
- Start your vehicle and see if you did jump a fuel pump relay.
- The fuel pump relay will work if the wires are correctly inserted into the right receptacles.
Bypassing a Fuel Pump Relay With Only One Wire
In bypassing a fuel pump relay with only one wire, the first thing that you have to do is to pull out a certain pump relay. Make sure that the car engine will not start even if you try it many times.
Next, get your wire and put one end to the left side of the hole where you remove the fuel pump and the other end to the right side. One is horizontal, and the other is vertical.
You should hear sounds to tell that you put it in the right holes. Another way to test it is by starting the car engine.
How To Test and Replace A Fuel Pump Relay
Finding the location of the fuel pump relay can differ depending on your vehicle. Some can be found when you open the hood, and some can be found near your car’s driver’s seat or the foot pedals.
To test the fuel pump relay, you need to take out your multimeter and choose resistance mode. Set up the required volt.
It’s to see if there is electricity in your pump relay.
If you hear a beeping sound when you connect your probes to the pins of the relay, it means that it is in good condition. When it doesn’t, then it’s broken.
Frequently Asked Questions
What are the signs that your fuel pump relay is bad?
- The check engine light is on.
- High mileage.
- Your car engine takes a long time to start.
- Problems with the vehicle’s performance such as idling, acceleration, stalling and doesn’t start.
- No noise is coming into your fuel pump.
- The car dies while you’re driving.
Can you still drive when you have a bad fuel pump relay?
If your car only has minimal faults and flaws, you can still use your car to go to certain places, but it is discouraged. Even if you know that your car’s fuel pump relay is already in bad condition, it will result in more problems.
Should you jump a fuel pump relay even if it’s damaged?
You bypass a fuel pump relay to inspect the electrical installation, not to replace your fuel pump relay. It only tests if your pump relay can get you to where you want to go or if it’s unsafe to use your car.
Regardless, only a well-tended car can get you where you intend to.