Do you want to learn how to direct wire a fuel pump? Are you not sure how to direct wire a fuel pump? Then this article is for you.
Fuel pumps ensure that the engine runs properly by providing the right amount of fuel. During the installation of this fuel pump, re-wiring is important. For this reason, this article will provide you with the necessary information you need on how to direct wire a fuel pump.
Read on!
How to Direct Wire a Fuel Pump
- From the ECU stock that was cut, which has a 12V supply, wire the pin 85 relays with it. The relay will get energized and turn on with the help of a 12V wire. Therefore, the Stock ECU no longer energizes the fuel pump but the relay.
- Connect pin 86 to the ground of the car. Ensure the ground is clean, and use the right wire to protect the relay from getting burned.
- Connect the relay pin 30 with a dedicated wire.
- From the factory wire cut through the fuel pump, run a wire to connect with the pin 87.
If you are expecting to receive more fuel from a factory pump, or you recently installed an aftermarket fuel pump, one thing you ought to do is to re-wire the fuel pump.
This is to ensure that you are getting an excellent, clean, and adequate voltage that won’t change or fluctuate because of other electrical situations the car might be going through.
In essence, this is to achieve the right voltage( 14 volts) so that the fuel pump can work as efficiently as possible. Since the average replacement cost of the fuel pump is about $700 and $300, it is essential to ensure it works properly.
A fuel pump and its factory wiring are linked with an electrical system in many parts. Any issues with this system, for example, fluctuating voltage, will affect the fuel pump as well. Imagine when the alternator begins to weaken, using the brighter beam lights or perhaps switching on the radio.
When you start operating a performance vehicle at its limits, it will start losing voltage, and the fuel pump will lose its flow, which will result in severe problems. One best means of avoiding such a problem is to make the voltage wiring of the fuel pump unique and connected with the battery to enable it to function consistently.
Also Read: How To Jump Fuel Pump Relay On A Chevy Truck (Step By Step)
How to Start Wiring Your Fuel Pump
Your first step should be to locate the fuel pump wiring. After that, locate the 12V wire supply from the fuel pump to the ECU or in a reverse manner. When you have located the wire, cut it off, so that half will be from the ECU while the other will be from the fuel pump.
Step 1: Choosing a Relay
It would be best to have a 14 gauge wiring and a 4-prong relay. You will need a relay that can withstand the amperage so that the fuel pump will not cause relay failure, which may also make you get stranded on the road.
Step 2: Re-Wiring in the Fuel Pump Relay
You should use an expert label such as 30, 85, and 87 on the pins of the relay. Here are steps on how to carry out the fuel pump relay wiring.
- From the ECU stock that was cut, which has a 12V supply, wire the pin 85 relays with it. The relay will get energized and turn on with the help of a 12V wire. Therefore, the Stock ECU no longer energizes the fuel pump but the relay.
- Connect pin 86 to the ground of the car. Ensure the ground is clean, and use the right wire to protect the relay from getting burned.
- Connect the relay pin 30 with a dedicated wire.
- From the factory wire cut through the fuel pump, run a wire to connect with the pin 87.
To elaborate on what you have just done. We can link the relay with a light switch. Whenever it gets 12V on the 85, the switch gets turned on, and there will be continuity on the relay, which will be between pin 87 and 86.
Since the battery is directly connected with pin 86, there will be an uninterrupted voltage flow to the battery without any fuel pump interruption.
The moment the vehicle is put off, the 12V on pin 85 will be lost, resulting in the closing of the coil found inside the relay, and the light will go off together with the switch. The pin 87 and 86 continuity will also be cut off, which will also cut the fuel pump voltage supply.
Check out this video for more tips on how to direct wire a fuel pump
Frequently Asked Questions – How to Direct Wire a Fuel Pump
Is it OK to bypass the fuel pump relay?
If it is for testing purposes, you can bypass it. However, it doesn’t come on with the ignition because car manufacturers find it necessary for it to be designed that way, therefore do not allow it to remain bypassed. There has been no reason for the reflow of the fuel pump relay.
What happens when you wire a fuel pump wrong?
When a fuel pump is improperly installed, it produces insufficient fuel or fails to work. When your engine does not receive enough fuel, it will start having fuel efficiency issues, and there will be power losses.
Do I need a relay for the fuel pump?
Depending on the amount of current the pump attracts, the thickness of the wire, the length of the wire run, and other kinds of controls needed on the pump system or circuit. No funky control, short thick wire, and the low current pump will mean you can run the car with no relay, while the opposite supports a relay.
What gauge wire should I use for a fuel pump?
According to manufacturers, a 1.5mm diameter wiring, a little bit bigger than 16AWG, will be needed.