Thread: Oil Pressure/fuel Pump Pressure Sw.

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Originally posted by riverhorse59
Do I understand this correctly? If the fuel pump relay goes bad the fuel pump will continue to run off the oil pressure sensor because it is in an open loupe as long as you have 4lbs or more of oil pressure.

it wont be in open circuit , with pressure on it, its in closed circuit.

you missed the boat a little. no car tonight. when the motor is not running the oil pressure sensor is in open circuit, when you start the motor then the oil pressure sensor will go to closed circuit and complete the circuit so the fuel pump can run. it don't have to be dead on 4 lb. of oil pressure, but as long as you've got oil pressure. about the only way to know that the main relay is bad is the car wont start as well as it did. you have to wait for the oil pressure to build up.

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