1999 jeep c. 4.0 litre engine. Fuel drips from muffler wont start
I have a 1999 jeep cherekee 4. litre engine. it appears the fuel pressure regulator is not working. Fuel is not being returned to the tank, but instead dips from the muffler, catalytic converter. How do I test the regulator, and what fuse relay, and or fuse is involved?
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The first thing i would check is the fuel system hook a fuel pressure gauge up to the fuel rail and check the fuel pressure, after you have verified the fuel pressure is good let the gauge sit and monitor how much "bleed down" occurs if the bleed down is out of spec i would bet the fuel pressure regulator is bad or theres a leaking fuel injector causing fuel to drip into 1 or more of the cylinders causing a rich condition at startup.
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.
Have you tried to switch your car on, wait 3 sec's and then start the engine? reason: If the pressure in the fuel system went down very fast, it need some sec's to arrive the pressure it needs to start. Also possible: switch on, wait 2 sec's, switch off, on and start. This does the same I told above. If that works, change the fuel pump or let this item checked be a specialist (it's expensiv to replace it).
Sound like fuel pump. Need to check fuel pressure. It seem to be finally getting back up to the motor, then starting up. Try parking the front of the car down hill and see if it starts up a few days in a row????
CHECK INJECTOR LEAK DOWN. INSTALL FUEL PRESSURE GAUGE, PRESSURIZE FUEL SYSTEM BY LETTING ENGINE RUN FOR A MINUTE, SHUT ENGINE DOWN, AND OBSERVE FUEL PRESSURE. IT SHOULD NOT DROP BY MORE THAN 15-20 PSI IN A HALF HOUR. IF IT DOES PRESSURIZE FUEL RAIL AGAIN AND REMOVE FUEL RAIL WITH INJECTORS STILL ATTACHED AND LOOK FOR FUEL DRIPPING OUT OF INJECTORS. IF FUEL IS DRIPPING REPLACE INJECTORS AND SEALS.