Locating the fuel rail on a 2013 chevrolet malibu 2.5 ecotec
I am wanting to replace the fuel pressure sensor on the fuel rail in my 2.5 ecotec and i have removed every thing down to the intake plenum,but dont see the fuel rail,is it under the intake ? and do i have to remove the intake to replace the fuel rail fuel pressure sensor ?
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First turn the ignition switch on and listen for fuel pump to come on for 2 seconds then cut off unless the engine starts.Next hook up a fuel pressure gauge to the fuel rail and with key on and engine off see what the pressure reads.If its not within the specs replace fuel filter and fuel pump.
Replacing the fuel pressure regulator, involves just replacing the regulator at the end of the fuel rail in the engine compartment, but fuel pressure sensor - does this mini-van have a fuel pressure sensor? replacing the fuel pressure regulator: (1) locate it at the end of the fuel rail in the engine compartment, (2) relieve fuel system pressure (3) disconnect fuel pressure regulator vacuum line. (4) remove fuel pressure regulator retaining screw (retain for re-use (5) using a shop towel to catch spilled fuel, lift & twist Fuel pressure regulator to remove it from the fuel rail. (6) remove/discard retainer and spacer bracket from the fuel rail. (7) remove fuel pressure regulator from the engine fuel return pipe. (8) remove/discard Fuel Pressure Regulator inlet O-ring (9) Check Fuel Pressure Regulator filter screen for contamination - if contaminated, replace Fuel Pressure Regulator. (10) Lubricate new Fuel Pressure Regulator inlet O-ring with clean engine oil & install onto the Fuel Pressure Regulator inlet. (11) Install the fuel return pipe onto the Fuel Pressure regulator (12) Install new retainer & spacer bracket into the slot on the fuel rail. (13) Install Fuel Pressure Regulator onto Fuel Rail & tighten Engine Fuel Return Pipe nut to 13 ft-lbs (17 Nm). (14) connect Fuel Pressure Regulator vacuum line, (15) Install Fuel Pressure Regulator attachng screw & tighten to 76 in-lbs (8.5 Nm). (16) Inspect & verify that retainer & spacer bracket is engaged in the slots on the fuel rail. Grasp & pull on the Fuel Pressure Regulator. to ensure that the Fuel Pressure Regulator is properly seated. (17) inspect for fuel leaks with this procedure: On 2sec,(holy rollers), off 10sec will be left on, inspect for leaks while running.
Keep in mind that you have several components there: - Fuel Pump Sender Assembly, - Fuel Pressure Regulator, - Fuel Rail Assembly, and - Fuel Injectors.
1.- Fuel Pump (Sender Assembly) - TESTING Refer to the accompanying charts for fuel pump diagnosis and testing.
The fuel injection system remains under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.
Fig. 3.1L engine OBD system check to be done before fuel pump
relay circuit diagnosis
Fig. View of the fuel pressure test port (Schrader valve)-3.1L
A - 3.1L engine fuel system pressure test (1 of 4) B - 3.1L engine fuel system pressure test (2 of 4) C - 3.1L engine fuel system pressure test (3 of 4) D - 3.1L engine fuel system pressure test (4 of 4)
Fig. The fuel pump/fuel sender module assembly is mounted in the
(the fuel pressure regulator, which is
located on the fuel rail assembly) NOTE: Before removing the fuel regulator assembly, place a clean
shop towel under the regulator to catch any fuel drips
Properly relieve the fuel system pressure.
If not done already, disconnect the negative battery cable.
On the 3.1L engine, remove the intake manifold plenum, as
On the 2.4L engine, remove the fuel rail. Refer to procedure
earlier in this section.
Detach the vacuum line from the regulator.
Place a shop towel under the regulator to catch any fuel that may
drip out. Unfasten the fuel pressure regulator retaining screw, then
remove the regulator by twisting and pulling it from the fuel rail.
Remove and discard the O-ring seal. Inspect the filter screen for
contamination and replace if necessary.
Prior to assembling the pressure regulator to the fuel rail,
lubricate the new rail-to-regulator O-ring seal with clean engine oil.
Place the O-ring on the pressure regulator and install the
pressure regulator to the fuel rail.
Install the retainer or coat the regulator mounting screws with an
approved thread locking compound and secure the pressure regulator in
place. Tighten the mounting screw to 76 inch lbs. (8.5 Nm).
If removed, install the fuel rail assembly to the engine.
The fuel return pipe must be connected before tightening the
regulator retaining screw to prevent the regulator from rotating.
Rotation of the regulator could damage the retainer and spacer bracket
and lead to a fuel leak at the regulator inlet.
Connect the fuel feed line and return line to the fuel rail
assembly, use a backup wrench on the fittings to prevent turning.
Attach the vacuum line to the regulator.
On the 3.1L engine, install the intake manifold plenum.
Connect the negative battery cable. Turn the ignition to
position for two seconds, then turn it to the
position for ten seconds. Turn again to the
position and check for fuel leaks.
The fuel filter (2) is located under the rear of the car, behind the fuel tank. There is no service interval for fuel filter replacement. Replacement is required only if the fuel filter becomes restricted.