GM 88984221
Fuel Pressure Regulator

The replacement of the Fuel Pressure Regulator requires the system pressure to be reduced first. Begin the operation by eliminating connection between the fuel return hose/pipe and Fuel Rail while also uninstalling the atmospheric vent hose from the Fuel Pressure Regulator. Eliminate all debris from the Fuel Pressure Regulator along with its surrounding location before taking out screws (4, 5). Use tools to remove the Fuel Pressure Regulator along with its o-ring seal from the Fuel Rail by discarding the o-ring seal. After extracting the Fuel Rail return pipe together with its o-ring seal from the Fuel Pressure Regulator you should discard the o-ring seal. Check the regulator filter screen for contaminants before replacing the Fuel Pressure Regulator unit when contamination is detected. Place the new Fuel Pressure Regulator filter and apply a small amount of mineral oil gm p/n 9981704 to the o-ring seals (2, 7) before installation. You should place the new o-ring seals (2, 7) onto both the Fuel Pressure Regulator and the Fuel Rail return pipe. Follow the sequence of pressing the Fuel Rail return pipe along with its o-ring seal into the Fuel Pressure Regulator. Then use the same method to insert the Fuel Pressure Regulator with its o-ring seal into the Fuel Rail. Tighten the Fuel Pressure Regulator screws (4, 5) to 8 n.m (71 lb in). Tie one end of the atmospheric vent hose to the Fuel Pressure Regulator port while the other end leads to the Fuel Rail through the fuel return hose/pipe. Perform a leak inspection by starting the ignition for two seconds, waiting ten seconds before restarting the ignition for testing fuel leakages.

The first step to replace the Fuel Pressure Regulator requires bleeding fuel system pressure from the system. Disconnect both the fuel return hose/pipe from the Fuel Rail and remove the atmospheric vent hose from the Fuel Pressure Regulator . Wash the Fuel Pressure Regulator along with its surrounding territory and afterward detach the Fuel Pressure Regulator screws (4, 5). Cut the Fuel Pressure Regulator and its o-ring seal off the Fuel Rail before disposal of the o-ring seal. You need to extract the Fuel Rail return pipe together with its o-ring seal from the Fuel Pressure Regulator but throw away this o-ring seal. Technology mandates testing the filter screen of the Fuel Pressure Regulator for foreign particles which require replacing if necessary. Installation requires fitting the new Fuel Pressure Regulator filter followed by application of minimal gm p/n 9981704 mineral oil to o-ring seals (2, 7). You should install o-ring seals (2, 7) to the Fuel Pressure Regulator first then to the Fuel Rail return pipe. Press the Fuel Rail return pipe together with its o-ring into the Fuel Pressure Regulator before pressing the Fuel Pressure Regulator joint with its o-ring into the Fuel Rail. Firmly torque the Fuel Pressure Regulator screws (4, 5) to 8 n.m (71 lb in). Connect one end of atmospheric vent hose to Fuel Pressure Regulator while the other end of fuel return hose/pipe attaches to Fuel Rail. Turn on the ignition for 2 seconds then wait 10 seconds before a final ignition turn on to verify fuel system leaks.