Walbro Fuel Pump for 2008 -11 STi/WRX/LGT Install:
Install guide for those looking to upgrade the factory WRX, STi, or LGT fuel pump. I recently found the stock pump to be inadequate when running high boost and E85. When ordering the pump, you DO NOT need the filter kit, it WILL NOT fit in the housing. Make sure to run the car down under the 1/4 tank mark before beginning. There will be gas spillage so make sure you have plenty of fresh air and towels around to clean up.
1.) Pop the gas cap off to relieve fuel pressure from the tank. Remove your lower rear seat by pulling upwards on each side and the middle. There are 3 snap in spots. Place your seat somewhere clean and out of the way. Once you do this you can see the fuel pump access cover and harness. Unplug this harness.
2.) Remove the 4 screws holding the access cover in place and place them somewhere safe away from the access cover.
3.) Now you can see the fuel pump access point. There are 3 fuel lines, 8 8mm nuts, and the electrical connector. Disconnect the electrical connector now and stuff it out of the way. Grab some of your handy shop towels and place them under the fuel lines in case of spillage. Once you have removed the fuel lines it should look like this:
4.) Remove all 8 of the 8mm nuts and place them somewhere safe. Gently remove the metal bracket surrounding the entire assembly to gain access to the housing and place it somewhere safe. Slowly remove the fuel pump assembly by contorting it, be careful not to damage the float or sensor. Once the housing is removed it may spill, make sure you have plenty of towels laid down in your car. If all went well it should look like this:
