I have a 1990 wrangler . and my problem is that it same like after it rains. the fuel pump stop working. And it will turn over but will not start. i've replaced. The fuel line, the computer, spark plugs and wires. and fuel pump. and new starter
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It maybe the fuel pump shut off when it get hot. Once it turns off have someone listen in the back to see if they can hear the pump come on. Also you can spray some carb cleaner inside the intake manifold when the car does not want to start. When you spray it try to start the car, if it starts right up you have a fuel pump problem. Otherwise check out your crank and cam position sensors as they tend to have the same symptoms.
Also, you will need to check out the crank position sensor, when the car turns off you can perform a spark test and see if you are getting good spark.
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First try shooting some starting fluid in intake manifold, and if fires up but still won't keep running, my guess next would be your looking and checking out your fuel pump. You can check that out my removing a line and see if fuel is pumping out of the out put of fuel pump. Because it it carburated its pretty easy to trouble shoot. It's going to be in most cases spark plugs , fuel pump.
It could be the pump but you need to verify if you can hear the pump running after it stalls and you turn the key back on to try and start it. If you don't hear it it isn't running. The pump is inside the tank but it dosen't come inside, you need to put it in there. That requires removing the tank. On a 90, there is a filter mounted on the chassis near the left rear tire. I'd replace that first as if you replace the pump, that should be replaced as well and if it's plugged up it may in fact be the only problem.