OEM GMC Envoy Fuel Rail

GMC Envoy Fuel Rail Parts Questions & Experts Answers

• Fuel Rail
  12592186
  Q: How to replace the fuel rail assembly on GMC Envoy?

  A: The first step to replace the Fuel Rail assembly requires releasing the fuel system pressure. The first step towards replacing the Fuel Rail involves disconnecting its feed pipe from the rail then taking out the Intake Manifold. Follow the instructions on the package when cleaning the cylinder head and Fuel Rail assembly with gm x-30a engine cleaner spray. Avoid letting Fuel Rail parts remain in liquid cleaning solvents during the process. Remove first the engine wire harness connector attached to the Fuel Injector harness in-line connector before extracting it from the rocker cover. Using caution when removing Fuel Rail attaching bolts will help safeguard both injector electrical terminals and spray tips but supporting the rail with a stabilizer helps prevent damage at the same time. Seal the fittings and insert plugging devices to stop any contamination. Disassemble the Fuel Rail assembly together with the injector lower o-ring seals from each injector before retaining the o-ring seals for disposal. The replacement process should continue after assessing that the Fuel Rail will remain in use. The Fuel Injector wire harness must be detached from the Fuel Rail while the fuel injectors must be taken off the rail. Installation of Fuel Injector harness to Fuel Rail must proceed before attaching fuel injectors to the Fuel Rail. You should lubricate new lower injector o-ring seals with clean engine oil before installing them on each injector spray tip before installing the Fuel Rail assembly. Spare 5 mm of threadlock gm p/n 12345382 (Canadian P/N 10953489) or equivalent on each Fuel Rail bolt threading before torquing to 10 n.m (89 lb in). Reattach the Fuel Injector in-line connector from the rocker cover to the engine wire harness before you install the fuel feed pipe between the Fuel Rail and connect the Fuel Injector electric cables. After installing the Intake Manifold you should connect the negative Battery Cable and check for leaks while performing these steps: turn on ignition with the engine off for 2 seconds followed by a 10-second ignition off before repeating on ignition and engine off and then checking for fuel leaks.