There is highly possibility that the fuel pump housing is cracked.
So I got the liquid gasket grey which is made by ThreeBond.
I could almost stop leaking. But regarding the right screw area, I found leaking slightly...
So I used Seal Tape for Thread. It's also made by ThreeBond.
And finally, I could stop leaking !!!
And also, I got the new Fuel Pump Housing.
When the Fuel Pump will be broken, I will use this one.