How to Bypass Fuel Pump Relay? [Easy Guide]

The majority of automobiles feature a fuel pressure pump relay that aids in regulating and controlling the electrical flow to the fuel pump. This helps prevent overloading of the pump and ensures that it receives the proper amount of electricity.

A critical component of the car’s fuel injection system is the fuel pump relay, which is frequently faulty and can leave you stranded in the middle of the road. So, as a temporary fix when you can’t call a mechanic, try to bypass the fuel pump relay.

However, you should be aware that in some situations, if you do not follow the right procedures for bypassing the fuel pump relay, things could get worse and more dangerous.

As a result, there is some risk involved when bypassing relays. Continue reading below to find out more about fuel pump relays and how to safely bypass them.


• Makes it simple to test the fuel injection pressure by turning on the fuel pump with the engine off.

• A technician can operate the fuel pump without using “key on” systems thanks to relay bypass.

• Operating range: 30 amp surge, 20 amp continuous (12V).

• It is impossible to precisely manage the interdependent operation of several engine components without relays.

How Can you Bypass fuel pump relay?

You may have felt frustrated when you frequently checked the fuel level in your automobile only to discover that it was still at empty. In order to solve this issue, you must bypass the fuel pump relay. Jumper cables will be useful for this.

Although the procedure is very straightforward, there are safety precautions that you must take in order to bypass the fuel pump relay safely. When the car does not sense or recognize electricity from the ignition switch, the fuel pump relay is a safety precaution to reset the system.

How to Bypass Fuel Pump Relay
How to Bypass Fuel Pump Relay

Items Required to Bypass Fuel Pump Relay

  1. A socket ratchet set or 10 mm socket wrench.
  2. Jumper cables or wire cutters.

First, locate the battery cables coming from each side of the battery and cut them off.

When you are sure it is safe, remove the wires from each post on your old fuel pump and connect them to the corresponding posts on your new one. Then, loosen both of them up enough to allow you to do so.

In order to complete this task, attach a jumper wire that is thinner than four gauges from one battery terminal wire back onto the original wire post. Next, attach a jumper wire from the fuel pump’s harness to one of the original posts. Take off the driving belt for the chain’s final link.

The next is to attach a jumper wire between the two unconnected posts. Make sure the wire is thicker than four gauges before doing this. Install your new fuel pump after reconnecting both battery cables to their original posts.

Step by Step Methods to bypass the fuel pump relay

To bypass the fuel pump relay, follow the steps below.

a)First, unplug the fuel pump relay, which is housed inside the TIPM plastic box beneath the hood of the car (sometimes called a power distribution center or relay box).
b)Typically, the terminals that are connected to the relevant components at the other end are where the fuel pump relay pins are situated.
c)To connect the terminals, use a copper wire with a small diameter and a length of 4 to 5 inches. It goes without saying that before connecting the terminals in the relay centre, copper wire ends that are about 1/2 inch in diameter should be stripped of their protective insulation.
d)Connect the terminals that correspond to the contact switch pins 87 and 30 in order to bypass the fuel pump relay using a single wire. (In the case of some vehicles' fuel pump relays, pins 3 and 5)
e)The fuel pump priming or buzzing sound will start to come from underneath the car as soon as the terminals are connected with the jumper wire.
f)To bypass the fuel pump relay, jumper cables with two pins on each end are available in the automotive market. You can also use this.
g)By doing this, you will bypass using the signals that the ECU sends to the fuel pump relay in order to turn on the contact switch.

Once it is finished, the fuel pump will always receive the battery voltage and work continuously, regardless of the ECU signal. The ECU’s grounding of the fuel pump relay is no longer a requirement for the fuel pump to operate.

Therefore, it is worthwhile to check for a bad fuel pump relay when the car won’t start or stalls out in mid-drive.

Why Would You Use A Fuel Pump Relay?

There are several reasons why car fuel pumps stop working, but the fuel pump relay malfunction is the most frequent one.

The relay, which transfers power from the battery to the pump, might not be operating as a result of corrosion or a blown fuse. The transmission of electrical current from your car’s battery to its fuel injectors is the main purpose of the fuel pump relay.

In order for gasoline to be adequately distributed throughout the engine and ignited when necessary, this converts it to a liquid form.

The typical symptoms of a malfunctioning fuel pump in a car are a considerable loss in gas mileage and an increase in sputtering at idling speeds. If so, you must first evaluate whether the pump relay is malfunctioning or not.

Then, if you don’t want to take your automobile to the shop and spend money on it, you can choose to bypass it and use a temporary remedy.

However, speaking with the specialist and allowing him to make a diagnosis would be preferable since he can advise whether you need a new fuel pump relay.

How Do I Jump A Chevy pickup Fuel Pump Relay?

Jumping the fuel pump relay will restart your vehicle if you own a Chevy pickup and find yourself unexpectedly stuck in the middle of no man’s land without any mobile reception.

Following are five simple steps for jumping fuel pump relays.

Find the relay.

Start by pulling over, parking the car, opening the hood, and looking for the relay box. Typically, it will be in the black plastic box close to the engine area.

It will typically be in a black plastic box near the engine bay in most cars, but you can also find it by locating a fuse box.

Cut the power to the battery terminals.

Disconnecting the relay from the battery is the next step. To achieve this, disconnect the battery terminals’ red and black cables.

Putting jumper cables together.

Start utilizing red cables (positive) and black cables for jumping (negative). Now that the cables are linked to the positive and negative terminals of the alternator or to the battery of another vehicle, you may start your car.

The automobile must now be started as the last stage. If it still won’t start, unhook the connections and give it another go.

Is It Safe To Bypass The Fuel Pump Relay?

If you bypass your car’s fuel pump relay, a number of different things might occur. Your car would first cease running, and starting it up again would be challenging.

Due to how close the battery is to all of these cables, the second issue would be that you might start an electrical fire.

These are some of the potential danger factors, so if you do not practice safety, they could also apply to you. For an expert who understands what he is doing, it is typically safe.

However, if you are a novice and have no experience with it, you should avoid disabling the fuel pump relay. Follow all safety precautions to prevent further harm to your car’s engine if you are forced to bypass it due to a lack of a choice.

Why Is The Fuel Pump Relay Needed To Be Jump Started?

Your fuel pump relay will eventually need to be replaced if you routinely drive a car. The electrical current that operates the fuel pumps in your car can be regulated with the use of fuel pump relays.

Depending on your car, you can find these components near the engine or in the fuse box. They typically last three to five years. Many problems can arise if your fuel pump relay is not working properly.

In light of this, it is always important to ensure sure your vehicle’s relays are still operating properly before replacing them with new ones by testing their functionality by bypassing.

The fuel pumps relay won’t be able to make good contact with the terminals of your fuel pump, which will prevent them from being able to supply enough fuel to your engine if it malfunctions. If this occurs, it’s possible for your car to stall while you’re driving or to stall after starting.

When your car is moving, a relay that activates the fuel pump and increases engine revs is activated. This makes it possible to accelerate more quickly and use less fuel.

But if the relay isn’t functioning properly or has failed, the engine won’t be able to rev as much, which could lead to a dead battery.

Often Asked questions on Bypass fuel pump relay

Q) Without a relay, will the fuel pump function?

A: Without a relay, a fuel pump cannot be operated. An electrical switch that is operated by another switch or power from a different source is known as a relay. The fuel pump receives power from the fuel pump relay so it can function. The fuel pump won’t be able to operate if there is no relay.

Q) What occurs if the fuel pump relay malfunctions?

A: The fuel pump won’t have power if the fuel pump relay malfunctions. Even though the engine may still turn over when the key is turned, it won’t be able to start because of a fuel shortage. It is strongly advised to have the vehicle carefully diagnosed because this symptom can also be brought on by a wide range of other problems.

Q) What activates the relay for the fuel pump?

A: The fuel pump and relay are two of the many components whose power is controlled by the ignition circuit, which also includes the ignition switch.

Q) What symptoms indicate a relay is blown?

A: It is rather easy to test a relay fuse using a multimeter. To measure resistance, set the multimeter to Ohms and touch the leads to the magnetic coil pins. It need to fall between 50 and 120. You have a defective electromagnet coil if it is outside of that range or indicates that it is open.

Final Thoughts

The fuel pump relay is turned on by the vehicle’s ECU once it has detected various signals that the fuel pump needs to be powered. The proper course of action in the event of a sudden fuel pump relay failure would be to temporarily solve the issue by bypassing the fuel pump relay. It is wise to think about replacing the fuel pump relay once the car is ready to be taken to any nearby auto shop because bypassing the fuel pump relay carries some hazards and can have repercussions on other vehicle components.

In general, the ratings of the fuel pump relay are comparable to those of many other relays found in the TIPM relay box under the hood. Therefore, before bypassing the fuel pump relay, it is advised to test switching the fuel relay with the same rating and see if the car starts or doesn’t stall while driving.

We hope the information above helped you better understand how to bypass the fuel pump relay and helped you with other car-related issues.

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