OEM Buick Terraza Fuel Rail

Buick Terraza Fuel Rail Parts Questions & Experts Answers

• Fuel Rail
  12587074
  Q: How to replace the fuel rail assembly on Buick Terraza?

  A: The replacement of Fuel Rail assembly starts by reducing pressure within the fuel system. The black o-ring must be placed above the brown one while installing the fuel injector o-rings because these rings differ in their material composition even though they have identical dimensions. Service activities require proper measures for blocking fuel pathways from pollutants by using plugs for holes and caps for fittings. Engine fuel pipe connectors should receive cleaning before separation to prevent leakage. Trim off the fuel feed pipe retaining clip before extracting the engine fuel feed pipe from its connection to the Fuel Rail. Unplug the evaporative emission (EVAP) pipe from the evap canister purge solenoid valve. After that disconnect and remove the upper Intake Manifold. The service requires separation of the fuel injector harness together with the Coolant Temperature Sensor and Camshaft Position Sensor electrical connectors and the main fuel injector electrical connector. The procedure starts with Fuel Rail retaining bolt removal followed by the Fuel Rail assembly extraction. The technicians replace each injector's spray tip-end injector o-ring seal after the extraction. Proceed with the fuel injector replacement method when needed. For fuel injector nozzle installation into the lower Intake Manifold bores use gm p/n 12345616 lubricant along with canadian p/n 993182. The Fuel Rail should be pressed while moving it to achieve proper injector seating followed by tightening Fuel Rail bolts to 10 n.m (89 lb in). Reconnect all electrical connectors and apply gm p/n 12377900, (Canadian P/N 10953529) lubricant to the fuel injector electrical connectors before finishing. Connect the Fuel Rail first to its engine fuel feed pipe then link the evap pipe to the evap canister purge solenoid valve before placing back the upper Intake Manifold. Check for fuel leaks by keeping the ignition on for two seconds followed by turning it off for ten seconds and on one last time while inspecting for any leakage.