Question about 1995 Jeep Cherokee

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I have a 95 cherokee with a four cyl. i have fire to the plugs adaquate fuel pressure, 65 to 75 psi cyl pressure, timing is correct but will not crank?!?!

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Cranking is what happens when you turn the key and the engine turns.... Is that what's happening?
If I remember correctly, fuel pressure at the rail should be about 35psi. If higher, check the regulator and the return line.(could be blocked)
Crank sensor sends signal to open the injectors (through computer to asd relay). Get a chiltons manual for good wiring diagrams. Crank sensor is a common failure and definitely should be checked.

Posted on May 27, 2010

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Fuel pressure 1998 jeep grand cherokee 4.0 L V6


You should have a test port on the Fuel Supply rail, use a tool from a local auto parts "Tool Loaner program" where you can borrow tools for free,w/a deposit of course,then follow the steps provided;

MPI Fuel System Pressure Test

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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  5. Connect vacuum line to pressure regulator. Note gauge reading. Fuel pressure should be approximately 214 kPa (31 psi).
  6. If fuel pressure is not approximately 55-69 kPa (8-10 psi) higher with vacuum line removed from regulator, inspect pressure regulator vacuum line for leaks, kinks or blockage. CAUTION: Fuel pressure will rise to as much as 655 kPa (95 psi) when the fuel return tine is pinched shut, shut engine down immediately after pinching oft fuel return line.
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Capacity Test

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  4. If the pressure is not to specification, check the following before replacing the fuel pressure regulator:
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My 95 blazer has a hard time stating i can hear the fuel pump.when it gets started it runs fine. do you think its my fuel pump or something else?


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Hi my name is Michael Im ASE ceretified and ben a mechnic 4 about 27 years. I just recently got a 95 pathfinder w/ a no start cenario. I know theese r nutorious 4 distributer problems and or computer...


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Starts and dies on acceleration then will not run


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1 Answer

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1 Answer

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1 Answer

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it sounds like you have a fuel issue. you should check for proper fuel pressure. its should be 48 PSI.

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if the fuel pressure is correct, its most likely a faulty fuel injector.

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