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Several components help a car start: 1) Starter, 2) Battery, 3) Camshaft sensor, 4) Crankshaft sensor, 5) Fuel pump, 6) Coils/Plugs. Start by testing each of those to ensure spark is reaching plugs on a consistent basis. If u can hear fuel pump - and you are sure fuel is in the tank (sometimes the fuel sending unit goes out, making you THINK fuel is there...). Cover each of those, and it should start...if the security system isn't being signaled to stay activated...security can also prevent a start... :-)
Combustion engine = 3 elements, fire, fuel, oxygen is it out of gas? its cranking but not ignite? i think its fuel related start at the carb or tank and go along the path from tank, pump then filter then lines dont ever sit there and crank your car for a long time if its not firing up because the starter will fry as well as the battery so check the fuel pump and filter
With the vehical jacked up and supported, inspect the front side of the fuel tank, it has a plastic ring going around the place where all the wires and fuel lines connect to the tank. Unscrew this ring and the gauge sending unit and the pump are connected to it. You should drain off most of the fuel before you take it aprt to avoid fires and the spilling of fuel. make sure the battery is disconnected to avoid sparks that may start a fire. If it does catrch fire get away as the fires like this are hard to put out and need to be avoided. stay away from other things that burn ( Buildings < other cars, wooden floors as they burn good too if splashed with spilled fuel. If you don't feel you can do it right have a professional do the work as they have the right equipment to do the job right.
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.
The fuel pump and fuel tank sending unit are removed as an assembly.
Remove the fuel tank. Please refer to Fuel Tank, Removal and Installation for the procedure.
Clean the area around fuel pump.
Remove the six fuel pump bolts.
The fuel pump and fuel tank sending unit assembly must be tilted to remove it from the fuel tank. Do not lift the assembly straight out of the tank, or damage may occur to the sending unit.
Lift the fuel pump and fuel tank sending unit assembly from the fuel tank and discard the gasket.
If you are getting "fire at the plugs", then it is probably a fuel delivery problem. It is very common for the fuel pump to fail in these vehicles, particularly if the truck is run below 1/4 tank of fuel very long. Slide under the truck at the tank and have someone turn on the key. if you don't hear a humming noise then your pump is not running. Check fuses, fuel pump relay, and sending terminals for bad connections. Replace the pump assembly.
From the info you provided, it seems like it is not getting constant supply of fuel. I think that don't have a carburator. It has a TBI(Throttle Body Injector. You should hear a faint humming noise at the back coming from within the fuel tank when you turn the key on. Thats the fuel pump. Your fuel pump may have gone out.