To remove the fuel system, start by relieving the fuel system pressure and disconnecting the negative battery cable. Then, remove the engine cover, strut tower crossbrace, and sound insulator. Next, remove the ignition coils and disconnect the high-pressure line pipe fittings. Loosen and disconnect the feed pipe fitting on the high-pressure pump, and disconnect the electrical connector from the pump. Loosen the high-pressure fuel pump bolts and remove the pump, making sure to replace the bolts and O-ring. To install the pump, ensure the camshaft lobe is at its Bottom Dead Center (BOC) base circle. Lubricate and install the bucket tappet, then set the pump into the cylinder head and tighten the bolts evenly. Finally, reconnect the negative battery cable, start the engine, and check for fuel leaks.