The car has been sitting for 3 months. I replaced the Fuel Pump, but will not start. It turns over but says "OIL PRESSURE SENSOR--SEE OWNERS MANUEL" Does it just need an oil change to start. Please advise.
Before you do that, you may need to replace the oil sensor switch but you need to have it checked first. If the oil sensor switch is bad, it may not allow your vehicle to start to not risk doing any engine damage.
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The oil pressure sensor only keeps the pump running after the vehicle is started. If you turn key to on, the computer should signal to the fuel pump relay, turning the pump on for a couple of seconds to pressurize the fuel system. Then the computer signal stops. When the key is turned to start-cranking the engine- the computer again energizes the fuel pump relay, keeping the pump running until the engine starts.
If you have a voltmeter or test light, pull the relay out and check the relay terminals. One should be hot at all times-the power feed for the pump. The computer signal will be on the coil side of the relay-will have power for 2 or 3 seconds after key is turned to on. Or it will have a constant signal when the engine is cranking. If you can find both hot terminals at the relay, then start looking for a bad wire from relay to pump, or a bad ground for the pump, or a bad ground for the relay's coil side. Post back if unclear or other questions. When you pull the relay out, the diagram for it will be on the side of the relay-telling you which is the power feed and the terminal to the pump, and the coil side of relay, both the coil power side and the coil ground terminal.
If it is not getting fuel when you first start it, nothing you replaced is involved. Could be a faulty fuel pump relay or check valve in the pump. You would need to check fuel pressure at the injectors before you first crank the engine. It should have at least 25-30 psi of pressure after sitting overnight. And the pump relay should power the pump for 3 or 4 seconds when you first turn the key switch on.
No such thing on your car. The temp sensor tells the computer what the engine coolant temp is. If it were faulty you would get a check engine light. I would have the fuel pressure checked before and after you crank the engine. The pump relay provides power to the pump when you turn the key on to recover some of the lost fuel pressure after the car sits. The one way valve in the pump is supposed to prevent the pressure from dropping. If the fuel pressure drops to zero it could take some time to crank the engine enough to get it back up.
fuel pick-up in tank is blocked it has a sock over the end as a gross filter to keep out any big junk from getting sucked into the pump and causing damage to it. the sock can get so plugged up that no fuel will flow, causing the pump to run for a short time then with no fuel flow to cool it it trips the safety and shuts off
On some chevys the oil pressure sending unit closes the circuit to continue the fuel pump to run after start. In the event of a wreck ,the car stops running thus no oil pressure thus turns off power to the fuel pump .A safety to help prevent fires. When you first start the car, the computer turns on the fuel pump for about 20 seconds just enough time to start and allow the oil pressure sending unit to close the circuit to allow it to continue running. when the car car has NO oil pressure or the sending unit fails ,it will start then shut down..as many times as you try to start. replace the oil pressure sending unit and secure a good conection. Dan
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump