Using a ratchet set, disconnect the fuel line that leads away from the fuel pump. Use the extra fuel line to tie it into the fuel-return line that comes back from the engine.
Connect the hose from the pressurized solvent system to the end of the fuel line leading into the motor (or you can also attach the system directly to the fuel rail).
Fill the pressurized system with the manufacturer-recommended type and amount of solvent, and then turn the machine on.
Have your helper start the car and let it run for 10 to 15 minutes. The solvent will cycle through the injectors and the engine, cleaning them out.