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Posted on Jul 14, 2010
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I did a oil change on my 1994 gmc suburban w/5.7L and it started leaking oil on the back of the motor by the intake and the brass fitting for the oil pressure sensor. It is a steady leak and will lose all oil in a 100 miles. Has anyone had this happen before and/or does anyone have a solution?

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Duane Wong

Duane Wong

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  • GMC Master 6,826 Answers
  • Posted on Jul 14, 2010
Duane Wong
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Joined: Jun 20, 2010
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OK, does it appear that the oil pressure sensor is leaking through the plastic to metal seam (on the sensor itself)?

Have had an oil pressure sending unit go bad and leak on a 1990 Oldsmobile Cutlass Calais that needed to be replaced.

REMOVAL & INSTALLATION C1500 Suburban 1994

  1. Disconnect the negative battery cable and drain the engine oil.
  2. Disconnect the sensor electrical lead and unscrew the sensor. The sensor can be found on the top side of the engine, near the distributor. To install:
  3. Coat the first two or three threads with sealer. Install the sensor and tighten until snug. Engage the electrical lead.
  4. Connect the battery cable and fill the engine with oil.

  • kmcelwee9 Jul 15, 2010

    I further investigated the problem and I believe that it is leaking out of the silicone gasket form the intake. They only have true gaskets between the heads and the intake and silicone the intake to the block. It just so happened to be leaking next to the brass fitting for the oil pressure sensor. Thank you for your time Duane.

  • Duane Wong
    Duane Wong Jul 15, 2010

    Oh, ok, so you found another oil leak at the silicon gasket from the intake. Leaks can happen anywhere, I suppose. Good work.

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