Question about 1995 Chevrolet Suburban

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Why is there three 3 pins on the oil sending unit of the 95 suburban w/350. why does the gauge peg at 80 when sending unit is disconected.

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  • gvmobilerepa Apr 01, 2011

    Can the sending unit be damaged by unpluging it and reconnect with or without battery disconneted ?

  • gvmobilerepa Apr 01, 2011

    YES Thank you.

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  • Chevrolet Master
  • 8,175 Answers

Hi, the fuel pressure sensor also serves as a switch for the fuel pump to provide an added conduction path for the pump when the oil pressure is normal. This uses 2 of the 3 pins. The sending part of the sensor consists of a resistor that varies with oil pressure. The resistance is high when the pressure is high. The signal is measured by the gage as the resistance between the signal wire (3rd pin) and ground (provided by the threading of the sensor into the engine block). Therefore, when you connect the signal wire directly to ground, it sees zero resistance and pegs the gage to zero. When the wire is disconnected, the resistance in infinite, and the gage pegs to high.
Are you having a problem with your sensor that I may help you with?

Posted on Apr 01, 2011

  • Jeff Turcotte
    Jeff Turcotte Apr 01, 2011

    No, I think it's pretty hard to damage unless you install it improperly. Just plugging and unplugging should not cause any harm, regardless of the battery being connected or not.

  • Jeff Turcotte
    Jeff Turcotte Apr 01, 2011

    If it's damaged, it's easily replaced. A new sensor is $23 at Autozone.

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