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Fuel injector problem , leaking fuel pressure regulator ,
Causes of gas in oil
On my 94 Chevy blazer, gas in the oil was caused by a ruptured diaphragm in the fuel pressure regulator that is attached to the fuel injector. Flooding the engine. An over abundance of gas in your cylinders will wash down your cylinder walls and accumulate in the oil pan.
the function of a fuel regulator is to maintain sufficient pressure in the manifold for the correct operation of the injectors . Fuel pumps being gear driven pumps will produce excessive pressure that will overcome the injector settings and flood out the engine . Therefore when the fuel pressure reaches a pre-set value the regulator opens and lets excess fuel flow back to the tank. It is normally located in the fuel manifold either in the end or on the side and some have a vacuum hose attached to them
How many fuel lines are going to the fuel rail? If there is only one line that you have a later model 2000 and the system is considered return less. This means that the fuel pressure is regulated at the fuel pump before the fuel gets to the fuel rail.
If there are two lines going to the fuel rail than the fuel pressure regulator has to be in between one of those lines and the fuel rail
More than likely, yes. If the regulator is controlled by a vacuum feed, try removing the hose from it and run the engine. If you feel that it will run off-idle after you've done this, replace the regulator and be on your way.
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.
For 2000 Chevrolet Truck Blazer
4WD 4.3L SFI 6cyl If your engine is a 4.3L V-6 with CPI (central point injection) it is
inside the upper intake manifold. The upper intake manifold is bolted on
top of the normal intake manifold.
The throttle body is mounted on
it and your fuel lines terminate into the center of this.
Removal & Installation
Relieve the fuel system pressure.
Remove the air cleaner outlet resonator.
Disconnect the engine wiring harness from the retaining clips at
the front of the engine.
Disconnect the fuel pressure regulator vacuum line.
Clean any dirt from the fuel pressure regulator and the
Disconnect the fuel return pipe.
Remove the fuel return pipe retainer.
Remove the fuel pressure regulator retainer.
Remove the fuel pressure regulator.
Inspect the regulator filter screen for contamination. If
contaminated, replace the fuel pressure regulator.
Fig. Fuel pressure regulator-4.2L engine
Install the regulator filter.
Install the new O-ring on the fuel pressure regulator.
Lubricate the fuel pressure regulator O-ring with clean engine
Push the fuel pressure regulator into the regulator housing on the
Install the fuel pressure regulator retainer. Tighten the
regulator retainer screw to 71 inch lbs. (8 Nm).
Install the fuel return pipe retainer. Tighten the return pipe
retainer screw to 71 inch lbs. (8 Nm).
Connect the fuel return pipe.
Connect the fuel pressure regulator vacuum line.
Connect the negative battery cable.
Inspect for leaks:
Turn ON the ignition for 2 seconds.
Turn OFF the ignition for 10 seconds.
Turn ON the ignition.
Inspect for fuel leaks.
Install the engine wiring harness into the retaining clips at the
front of the engine.
The fuel injectors may need to be cleaned. Also the issue could be the fuel pump or fuel pressure regulator. You can test this by renting a fuel pressure guage from the auto store and hooking it up to the fuel rail on your engine. The port you hook it to is called a schrader valve and looks similar to a tire stem valve. If the pressure is low the problem could be either the fuel pressure regulator or the fuel pump. Good luck and if you found this solution helpful please rate it.