3. Observe the following precautions when removing and installing the injectors. (a) Never reuse a O-ring. (b) When placing a new O-ring on the injector, use care not to damage it in any way. (c) Lubricate the new O-ring with spindle oil or gasoline before installing it - never use engine, gear or brake oil. 4. Install the injector to the delivery pipe and cylinder head as shown in the illustration. HINT: Install the spacer with the black ring side facing upward. 5. Confirm that there are no fuel leaks after performing any maintenance on the fuel system. (a) With engine stopped, turn the ignition switch ON. (b) Using SST, connect terminals -|B and Fp of the check connector. SST 09843-18020 HINT: The check connector is located near the No.2 junction block. (c) When the fuel return hose is pinched, the pressure within the high pressure line will rise to approx. 4 kg/cm² (57 psi, 392 kPal. In this state, check to see that there are no leaks from any part of the fuel system. NOTICE: Always pinch the hose. Avoid bending as it may cause the hose to crack.