Question about 1995 Chevrolet Suburban
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.
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Posted on Apr 01, 2011
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Posted on Jan 02, 2017
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