Question about 1996 Jeep Grand Cherokee

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1996 jeep cherokee 4.0 MPI. need a fuel pressure regulator that apparently is an integral part of fuel pump/sending unit. jeep no longer makes them. can only buy pump.?? is the regulator IN THE PUMP???

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  • timetrvlr47 Aug 19, 2010

    O.K. I'm having a problem maintaining fuel pressure, especially after a short trip. cannot buy whole assembly as they are no longer being produced. replaced fuel filter and checked for leaks (vacuum/fuel) and could not find any. I can only buy pump without sending unit. IS it possible to build from parts or IS THE REGULATOR INTERNALLY IN THE PUMP?



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Lets start with technical bulletin how to determine whether fuel pressure regulator is at fault or not :-


Use this test in conjunction with the Fuel Pump Capacity Test, Fuel Pressure Leak Down Test and Fuel Pump Amperage Test found elsewhere in this group.

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 operational. It is also used to keep the fuel supply line full of gasoline when pump is not operational. 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. When the electric fuel pump is activated, fuel pressure should immediately (1 - 2 seconds) rise to specification.

All fuel systems are equipped with a fuel tank module mounted, combination fuel filter/fuel pressure regulator. The fuel pressure regulator is not controlled by engine vacuum.


1. Remove protective cap at fuel rail test port. Connect the 0 - 414 kPa (0-60 psi) fuel pressure gauge (from gauge set 5069) to test port pressure fitting on fuel rail
2. Start and warm engine and note pressure gauge reading. Fuel pressure should be 339 kPa ± 34 kPa (49.2 psi ± 5 psi) at idle.
3. If engine runs, but pressure is below 44.2 psi, check for a kinked fuel supply line somewhere between fuel rail and fuel pump module. If line is not kinked, but specifications for either the Fuel Pump Capacity, Fuel Pump Amperage or Fuel Pressure Leak Down Tests were not met, replace fuel pump module assembly.
4. If operating pressure is above 54.2 psi, electric fuel pump is OK, but fuel pressure regulator is defective. Replace fuel filter/fuel pressure regulator. .
5. Install protective cap to fuel rail test port.


The fuel pressure regulator is part of the fuel pump, it is in the fuel tank.

On this vehicle the regulator is part of the pump and not serviceable separately so if the regulator is bad the whole pump assembly will need to be replaced.

Good Luck!!


Posted on Aug 19, 2010

  • taran_2005
    taran_2005 Aug 19, 2010

    Thanks for your response!!

    IS it possible to build from parts or IS THE REGULATOR INTERNALLY IN THE PUMP?

    Ans. Regulator is a part of the pump. It cannot be build from the parts and you need to replace the COMPLETE PUMP ASSEMBLY .

    Good Luck!!




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The MPI fuel system used in vehicles equipped with a 4.OL engine employs a vacuum balanced pressure regulator. Fuel pressure should be approximately 55-69 kPa (8-10 psi) lower with the vacuum line attached to the regulator than with the vacuum line disconnected. System fuel should be 214 kPa (31 psi) with the vacuum line connected to the regulator and 269 kPa (39 psi) with the vacuum line disconnected. CAUTION: Some fuel may be discharged when connecting fuel gauge to fuel rail.
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  1. Remove the cap from the pressure test port in the fuel rail.
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