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If it has a constant reading you might have a bad oil pressure sending unit.Im not really sure where yours is located because there are different locations for different vehicles.Your local auto parts store can give you the exact location for your vehicle.
On the v-6 engines the oil pressure switch feeds the fuel pump. I'm not sure about your 1500. You didn't say what engine you have, so I will assume it is a v8. The oil pressure switch should be behind the distributor, near the firewall. You can use a paperclip as a jumper in the electrical connector that goes to the oil pressure switch. If it's the switch or low oil pressure, the jumper should complete the circuit and energize the fuel pump.
This is an all too common problem with the Cavalier and other GM J-body cars. Usually it is because of the crankshaft position sensor or the harness going between it and the DIS (aka ignition module). Without the DIS seeing a signal from the crank sensor, it doesn't know when to trigger fuel and spark.
Sometimes this can also be caused by a faulty ignition switch. The switch will allow you to "crank" the car, but it doesn't make the proper connections for the ignition system, so the car never actually runs.
The previously indicated oil pressure switch could also be causing the problem, but if you hear your fuel pump run then it's OK.
Hopefully this helps. If not, your Cavalier is as messed up as mine and probably not worth fixing.
The oil pressure switch relays the oil pressure in the engine to the
instrument cluster. The switch will illuminate the
OIL PRESSURE
light if the oil pressure drops below 2psi (13 pa). The switch
is usually located on the side of the engine, under the intake manifold
on the 2.2L engine and on the side of the intake camshaft housing on
the 2.3L/2.4L engine.
Fig. 1: The oil pressure switch is located on the engine block
under the intake manifold and is accessible from underneath the
vehicle-2.2L engine
Other, the low oil level switch activates the
OIL
light in the instrument cluster when the oil level in the pan
goes below a certain level. The switch is mounted on the oil pan.
It sounds like the fuel pressure regulator has gone bad and needs to be replaced. Start with that if your engine is flooding over with gas as you ****. If there is an Auto Zone around you area, have them scan the car for any DTC codes that may be related to your car not starting like a bad MAP sensor which would also cause a no start when the engine is hot. Auto Zone also carries the parts you will need to replace and can give you the step by step instructions to replacing the parts with common tools. If your good with tool both job should take about 30 min to replace. Good luck and keep me posted
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