Scion 23270-28020 Damper Assy, Fuel Pressure Pulsation

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To relieve fuel pressure, unplug the negative battery terminal cable and remove the engine cover. For four-cylinder models, disconnect the fuel supply line from the Fuel Pump Pulsator and remove the damper from the fuel rail. Detach the fuel line sub-assembly from the Fuel Pump Pulsator and remove the damper. Use a new O-ring and tighten the Fuel Pump Pulsator bolts. For V6 models, unscrew the pulsation damper from the fuel rail, remove and discard the old sealing washers, and install new sealing washers before tightening the damper. For SL engines, drain the engine coolant, remove the upper intake manifold, withdraw the Fuel Pump Pulsator from the fuel rail, install a new O-ring onto the damper, and then reverse the removal process.

The first step to removing the fuel pump is to relieve the fuel system pressure and disconnect the negative battery cable. Next, remove the fuel pump/Fuel Level Sensor and the fuel filter retaining screw from the fuel tank. Next, separate the fuel filter from the fuel pump/ fuel level sending unit and remove the fuel pressure regulator mounting screw. For installation, follow these steps in the reserve order making sure new O-rings are installed on the fuel pressure regulator and fuel filter.

Make sure the O-ring comes out with it.

Disconnect the fuel line connector where it joins the pipe from the fuel pulsation damper at the end of the fuel rail.