How do you hardwire a fuel pump with a relay?
Wiring in the Fuel Pump Relay
- Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut.
- Wire pin 86 to a good ground on the car.
- Run a dedicated wire from your battery to pin 30 on the relay.
- Run a wire from pin 87 to your factory wire that you cut that runs to the fuel pump.
Can you wire a fuel pump directly to the battery?
Registered. Yes, they both go to the positive side of the battery.
Is it hard to change a fuel pump?
Replacing your fuel pump isn’t as hard as you might imagine. In most, you must drop the fuel tank, and first drain most gas if needed. Some vehicles have an access panel in the body to get to the top of the tank to remove the assembly without dropping the tank.
Do I need to hardwire my fuel pump?
It is also worth mentioning that if you do install a pump larger than 320 LPH, it is possible to damage the pump and shorten its life if you are not powering is sufficiently. So if you are putting any large fuel pump a direct wiring kit is strongly recommended.
How do you wire a fuel pump relay?
Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. This 12v wire will now energize the relay to turn on. So now instead of the stock ecu energizing the fuel pump, it will energize this relay.
Why do I need to rewire my fuel pump?
When putting in an aftermarket fuel pumpor looking to get more fuel out of your factory pump, one mod worth doing is re-wiring that fuel pump. The purpose of this is to make sure that the fuel pump is getting a good, clean voltage that won’t fluctuate or change based on other electrical conditions the car is going through.
What kind of wiring do you need for a fuel pump?
At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU. Choosing a Relay The relayyou need should be a four-prong relay with at least 14-gauge wiring.
Why does the fuel pump not turn on?
The fuel pump should run for 2 seconds and turn off until the truck is started. If this does not happen you have a clue to the problem. If it runs when he pours gas down the throttle body the ignition is fine. It is fuel related. You need three things to make an engine run.