What should the fuel pressure be on a Jeep Liberty?
Normal operating pressure should be 339 kPa +/–34 kPa (49.2 psi +/–5 psi). (7) Shut engine off. Fig. 2 CONNECTING ADAPTER TOOL—TYPICAL 1 – VEHICLE FUEL LINE 2 – TEST PORT “T” 3 – SPECIAL TOOL 6923, 6631, 6541 OR 6539 4 – FUEL PRESSURE TEST GAUGE 5 – FUEL LINE CONNECTION AT RAIL 6 – FUEL RAIL KJ FUEL DELIVERY 14 – 3 FUEL DELIVERY (Continued) 4.
Why is there no pressure on the fuel rail?
If the pressure at the exit side of the fuel filter is normal and yet the pressure on the fuel rail is essentially zero, it’s possible the fuel pressure regulator has failed wide open, essentially preventing sufficient pressure from building.
Where is the fuel pump relay on a Jeep Liberty?
STANDARD PROCEDURE – FUEL SYSTEM PRESSURE RELEASE Use following procedure if the fuel injector rail is, or is not equipped with a fuel pressure test port. (1) Remove fuel fill cap. (2) Remove fuel pump relay from Power Distribu- tion Center (PDC). For location of relay, refer to label on underside of PDC cover.
What is the check valve on a Jeep Liberty?
Check Valve Operation: The electric fuel pump outlet contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when pump is not oper- ational. It is also used to keep the fuel supply line full of gasoline when pump is not operational.
What is the fuel pressure on a Jeep Cherokee?
The fuel pressure specification, from the Jeep repair manual, is 30 to 35 PSI. The only way this specification can be checked is by using a fuel pressure gauge.
How to test the fuel pump in Jeep 4.0L?
Connect the fuel pressure gauge to the Schrader valve on your 4.0L Jeep’s fuel injector rail. When ready, ask your helper to cycle the key on and off but don’t crank the engine while you observe the fuel pressure tester’s gauge.
Where is the check valve on a Jeep Cherokee?
Well, I replaced the fuel pump, both fuel filters, and the fuel pressure regulator with the check valve on top of the tank. The jeep now starts easily and the check valve seems to be doing what it’s supposed to be doing. I was unable to get any pictures, as I was so greasy and grimy the last thing I wanted to touch was my camera.
If the pressure at the exit side of the fuel filter is normal and yet the pressure on the fuel rail is essentially zero, it’s possible the fuel pressure regulator has failed wide open, essentially preventing sufficient pressure from building.
Where is the fuel return line on a Jeep Liberty?
A fuel return system is provided within the fuel pump module using check valves. A separate fuel return line from the engine to the tank is not used. The fuel pressure regulator and the main fuel filter are not combined. They are separate items.
How to test for fuel leak in Jeep Liberty?
DIAGNOSIS AND TESTING – FUEL PRESSURE LEAK DOWN TEST Use this test in conjunction with the Fuel Pump Pressure Test and Fuel Pump Capacity Test.
What causes a fuel leak in a Jeep Liberty?
If pressure now holds at or above 30 psi, a leak may be found at a fuel tube/line. If no leaks are found at fuel tubes or lines, one of the check valves in either the electric fuel pump, fuel fil- ter or fuel pressure regulator may be leaking.
What happens when fuel pressure drops to 0 psi?
After the vehicle has cooled down, fuel pressure may drop to 0 psi (cold fluid contracts), but liquid gasoline will remain in fuel supply line between the check valve and fuel injectors. Fuel pressure that has dropped to 0 psi on a cooled down vehicle (engine off) is a normal condition.
How to troubleshoot a no start Jeep 4.0L?
More specifically, this means that troubleshooting the problem requires that you check and confirm that: All 6 cylinders are getting spark (with a spark tester). That the fuel pump is creating enough fuel pressure. And if necessary, check the engine’s health with a compression test. I’ll go into more specific details in the following headings: 1.)
What causes bad fuel pressure in Jeep Liberty?
Negative results from one or more tests may not necessarily indicate a bad pump. However, a close inspection will help you isolate a possible problem like fuel leaks on the lines and near the pump, bad line connections or an obstructed pump strainer inside the fuel tank.
DIAGNOSIS AND TESTING – FUEL PRESSURE LEAK DOWN TEST Use this test in conjunction with the Fuel Pump Pressure Test and Fuel Pump Capacity Test.
What happens if the fuel pump fails in a jeep?
If the fuel pressure sensor does not detect enough fuel pressure in the injector fuel rail, it WILL immediately shut the engine off. Doesn’t matter if due to a failed fuel pump, a busted injector, a big hole in the high pressure fuel circuit, whatever.
What should the fuel pressure be on a Jeep Cherokee?
What’s the problem with my 2002 Jeep Liberty?
Hi friends. I have a Puzzler-worthy issue going on with my 2002 Jeep Liberty (LTD, 4WD, V6). A few weeks ago (Christmas Eve!) it started to stutter when slowing down to a stop, and then – after a few times of doing that – began the bigger problem of completely stalling out/shutting off once at a stop (in traffic, at a light/stop sign).
Normal operating pressure should be 339 kPa +/–34 kPa (49.2 psi +/–5 psi). (7) Shut engine off. Fig. 2 CONNECTING ADAPTER TOOL—TYPICAL 1 – VEHICLE FUEL LINE 2 – TEST PORT “T” 3 – SPECIAL TOOL 6923, 6631, 6541 OR 6539 4 – FUEL PRESSURE TEST GAUGE 5 – FUEL LINE CONNECTION AT RAIL 6 – FUEL RAIL KJ FUEL DELIVERY 14 – 3 FUEL DELIVERY (Continued) 4.
A fuel return system is provided within the fuel pump module using check valves. A separate fuel return line from the engine to the tank is not used. The fuel pressure regulator and the main fuel filter are not combined. They are separate items.
Check Valve Operation: The electric fuel pump outlet contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when pump is not oper- ational. It is also used to keep the fuel supply line full of gasoline when pump is not operational.
Where is the fuel tank located on a Jeep Liberty?
OPERATION Fuel is picked up in the fuel tank by the fuel pump module. This module is located on the bottom of the fuel tank. A fuel return system is provided within the fuel pump module using check valves. A separate fuel return line from the engine to the tank is not used. The fuel pressure regulator and the main fuel filter are not combined.