Do the fuel relay send power to fuse block?

No, the fuel pump relay doesn't send power *to* the fuse block. Instead, it receives power *from* the fuse block (usually through a fuse dedicated to the fuel pump circuit) and then uses that power to switch the power *to* the fuel pump. The relay acts as a switch, controlled by the car's computer or other circuitry, to turn the fuel pump on and off.