Question about 1995 Jeep Wrangler

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My 1995 4.0L YJ has a miss while idling and hesitation while driving. I have checked the fuel pressure, 50 PSI, however when I removed the vacuum line from the fuel pressure regulator it did not fluctuate like it was supposed to. I have replaced the following: fuel filter, ignition coil, spark plugs and wires, pick up coil (distributer is only 4 months old), and crank sensor. Anyone have the same problem?

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  • k5muddog Aug 01, 2009

    replaced fuel pressure regulator and still having same problem. Checked the vacuum and had 18 in hg at regulator.

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  • Jeep Master
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If the fuel pressure does not change when you disconnect the vacuum hose on the regulator, change the regulator (There is vacuum at the hose, correct?) Also, check the return line for kinks and internal obstructions.

Posted on Aug 01, 2009

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  2. Without vacuum applied to the regulator, the 3.5L engine fuel system operates at 48 psi (331 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 39 psi (269 kPa).
  3. The fuel system pressure varies with the different amounts of manifold vacuum applied to the regulator. If the pressure is NOT correct, record the pressure and remove the gauge.

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If no engine light, the first thing I would check is the fuel pressure regulator. Pull the vacuum hose off the regulator and plug it with a golf tee. Start the engine and see if gas comes out the vacuum port on the regulator. Is indicates a busted diaphram. Even if the diaphram is good, I would then borrow a fuel pressure gage and run the tests below to make sure the regulator is working to keep the pressure at 39psi. Let me know if this isn't it or you have more questions.

  1. Relieve fuel system pressure.
  2. Turn ignition switch OFF and disconnect the negative battery cable.
When disconnecting any fuel system hoses, always place a shop towel to prevent residual fuel from spaying.
  1. Disconnect the high pressure hose at the delivery side. Using a fuel pressure gauge and adapter (09353-24000 or equivalent), install the adapter to the delivery pipe.
  2. Connect the negative battery cable.
  3. Activate the fuel pump, by applying battery voltage to the fuel pump drive terminal. Check that there is no leakage from pressure gauge or connections.

jturcotte_284.gif


Fig. Fig. 12: Fuel pump drive terminal location-Excel

  1. Disconnect the vacuum hose from the pressure regulator and plug.


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Fig. Fig. 13: Fuel pump drive terminal location-Sonata

  1. Operate the engine at idle and check the fuel pressure. Fuel pressure should be 47-50 psi (330-350 kPa).
  2. Reconnect the vacuum hose to the pressure regulator. With the engine idling, fuel pressure should be 39 psi (270 kPa).
  3. If the specified values are not met, make the necessary repairs, as indicated in the diagnosis chart.
  4. Shut the engine OFF. Check that the fuel pressure is maintained at the value indicated in Step 8, for approximately 5 minutes.
  5. Relieve the fuel pressure.
  6. Remove the fuel pressure gauge and reconnect the high pressure hose, using a new O-ring.
  7. Start the engine and check for leaks.

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Cheers.

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