Question about 2001 Jeep Grand Cherokee

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My oil pressure is dropping and at the same time my car is idleing to where it seems like my fuel pump is dying. Are the 2 related. If I step on the gas the oil pressure picks up and the my car gets gas thru the pump . This is a 2001 jeep grand cherokee 4.0L 242 6cyl

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  • Zaraki May 14, 2010

    Check the engine oil, is the engine reading full on oil?

  • sml10002001 May 14, 2010

    Last weekend, my oil pressure was normal, then all of a sudden when idleing at a light it dropped to where the "check gauge" light comes on. At the exact time time this happened "at idleing" my car is cutting off similar to a fuel pump not pumping.If I step on the accelerator at idleing the oil pressure goes back to normal range and also the car doesnt cut off with respect to what it seems like fuel not getting to the engine or so it seems like. I watched a video on the internet in where a bad oil pressure switch can cause this problem but he had a taurus in his shop by where the fuel pump will shutoff if it sees a drop in oil pressure but Im not sure on a 2001 jeep grand cherokee if that holds. My oil is normal, car doesnt burn oil at all,its not milky, doesnt smell. I usually do my own repairs and can diagnose many problems myself but Im a bit confused about this one. I was up till 3 am last night on the inet and many articles lead to a bad oil pressure sending unit (switch) near the oil filter that can cause this dual issue.Yes, engine oil is right on the full mark. Jeep has 212k but rides like a gem.I take good care of it.
    There is no check engine light either.

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  • Master
  • 2,317 Answers

Your oil pressure will increase and decrease with the speed of the engine. As long as your oil pressure increases, that's ok. The idle problem could be caused by a dirty fuel or air filter. I would start with replacing the fuel filter and check the condition of the air filter.

Posted on May 14, 2010

  • Zaraki May 14, 2010

    Yes, it is not uncommon for the fuel pump circuit to be ran through the oil pressure switch, it is to protect the engine from damage due to loss of oil pressure.

    It is either a defective or leaking OPSU (Oil Pressure Sending Unit) or the oil pump is actually going out in that engine.

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