BIKE CARB (itbs) conversion FUEL supply - how to

When converting from fuel injection to bike carbs you are basically making big changes to two things. Once is the size and shape of your intake and the other is the way you deliver fuel to your engine.
You have to make changes to the fuel system because unlike fuel injection, carburetors require a much lower fuel pressure to run properly. EFI fuel pressure is around 70-80 psi at the pump and 35-40 psi at the fuel rail, while carburetors just need 3-5 psi to run properly.
To get that kind of fuel pressure you have two options. Make your stock efi fuel pump do its job and pump fuel and then reduce the pressure somewhere down the line by using a fuel pressure regulators. To do this properly you also need a fuel pressure gauge and a return line to the tank. This ends up being kinda complicated and makes the engine bay kinda messy. Also, good fuel pressure regulators, like those made by malpassi, are relatively expensive and cost anywhere from 80 to 100 USD. The good thing about this setup is that you retain your stock fuel pump and can easily switch back to EFI.
Now option number two, which is what I did, will also enable you to keep your stock efi fuel pump and costs a lot less. Option number 2 is to use an actual fuel pump from a motorcycle. These are cheap, readily available, super easy to install and don't need a fuel pressure regulator or a fuel pressure gauge or a return line to the tank. There is a bit of a catch tho, and that's that you have to somehow give them access to the fuel in your fuel thank without using the fuel lines used by your efi fuel pump.
There is a way to do this without removing the tank, and that's by using the fuel drain plug at the bottom of the fuel tank of the mr2 mk1. Once removed simply modify the fuel drain plug by drilling and welding in an outlet.
The install of the pump is inline, all you need is a hose going from the tank to the pump and from the pump to the carbs. I added a fuel filter between the tank and pump for good measure. These motorcycle fuel pumps need to be installed horizontally and as low in the car as possible. When it comes to the electrical connection the fuel pump just needs two wires. One is switched 12v power and the other is ground.
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