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Oil Pressure Gauge problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Hossbaby50, Dec 1, 2002.

  1. Hossbaby50

    Hossbaby50 3/4 ton status

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    When I turn my key into the on position (without starting the truck) the oil pressure gauge shoots to 60+ even though it has no oil pressure. When the truck is running it still is at 60+, so anytime the key is on it reads 60+. Does anyone know what is wrong or what my problem might be? Any help is appreciated. Thanks

    Harley
     
  2. unsane

    unsane Guest

    Sounds like maybe a bad ground? Anyone else?
     
  3. frankin5

    frankin5 Super Mall Crawler Premium Member

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    Take the wire off the sending unit and turn on the key. If the gauge goes to 60+ then the wire from the gauge to the sending unit is shorted to ground. If it doesn't then i would change the sending unit.
     
  4. 83bowtyblazer

    83bowtyblazer 1/2 ton status

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    It has too much oil in it. Drain some out. Just Kidding!!! /forums/images/graemlins/grin.gif I agree with the bad ground.
     
  5. Hossbaby50

    Hossbaby50 3/4 ton status

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    Where exactly is the sending unit for the oil presure gauge? I have heard that there are 2 on some trucks. Which one (if there is 2) should I check. Motor is GM crate 350. I have heard it is on the drivers side head somewhere. Thanks

    Harley
     
  6. fortcollinsram

    fortcollinsram 1/2 ton status

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    Harley,

    The oil press. sender on mine is on the very back part of the block on the drivers side just above the oil fliter....that is the only one I know of on my engine...THe BBC I am building has the oil sender on the front drivers side of the block...but that engine is f'd up; it has 3 temp senders...I would check for the ground issue...I had that problem earlier this fall...

    Chris
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    The sender is typically next to the distributor, drivers side, a big "bell" shaped piece. One wire to the top of it.
     
  8. R72K5

    R72K5 Banned

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    in what year ? '77-up electric, 76-down hydraulic tube operated
     
  9. K5Kell

    K5Kell Guest

    I have a similar problem in my '87 blazer except that even with the key off the needle is as far to the right as it will go. Is this a possible ground or is the gauge bad? I allready replaced the sending unit with no result.
    -Kell-
     
  10. caryhenry

    caryhenry Registered Member

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    Is the sender you're talking about go into the block right below the header? Also, what is an ideal oil pressure for a 305?
     

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