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Big job, friend. Pull the gas tank and wash it out really well. There are places that will do that for you, but I don't know how far you'd have to go to find one. Next, remove your fuel filter, and blow out your gas lines with high pressure air. You will need to be sure the gas lines are detached at both ends. Then address the fuel injectors and the injector pump, if you have one. These need to be blown out. I hope this works. Also, buy a locking gas cap, and if you live in a bad neighborhood, you may wish to put a lock on the gas door as well. Be blessed.
I bet it's the gas. After some time the gas will no longer be volatile enough to start the car. Try draining all the fuel and putting in some fresh gas. Remember, when you try to start it again you'll need to get the new gas through the pump and lines before it will start. Also, check the condition of the injectors. Old gas can start to break down and build up a film that could be on your injectors (or clog your fuel filter- better check that too). Hope this helps.
Do you hear the fuel pump running on the prime cycle (when you turn on the key) (runs for 3 seconds) or when you have oil pressure?Have someone listen back by the tank for the wrrrrr.If you do have to change the fuel pump,make your life easy and just tilt up (lift) the pickup box from the drivers side to access the fuel pump.Takes 20 minutes to change it that way.
if it only runs when your spraying fluid into it then you have a fuel pump problem that will have to be checked out.check to see if you can hear the pump run when trying to start the car at the fuel tank or by removing the gas cap and listening in the filler tube you should hear a humming noise.then while someone is trying to start the car hit the gas tank with something but not so hard you dent it if it starts then the pump will need replacing.the fuel pump is located in the gas tank.
the reason the injectors stopped is because the motor is not running.this is a safety precaution built into the computer so the engine won`t flood.if the fuel pump is not working then you will have to check powers and grounds at the fuel pump connector by the gas tank to see if the unit is getting fed power and ground.someone will have to try to start the car while you check this out as there is a 2 second prime circuit if the car is not turning over.also this system uses the distributor to know that the engine is turning over to start.you may have a bad pickup coil in the distributor.this system also grounds the injectors through the ecm so you should have power to the injectors when the ignition is turned on,for your information.
What you need to do is have an assistant turn the key on (not try to start, just turn the key on) while you have the gas cap removed and your ear down by the gas tank fill tube. When they turn the key on you should hear a whirl only for 3-7 seconds. If you hear nothing more than likely you will need to change your fuel pump. Attempt this test on several tries at different times several hours apart before you **** your tank out to give it ample time to relieve any fuel pressure that may be built up thus causing your pump not to respond. BUT, if you are not getting any fuel you are not getting any pressure built up so it should be making some sound. How many miles do you have on this vehicle? 9 times out of 10, sorry to say, you'll be replacing the fuel pump. It sounds like to me that you have thourouly checked every other possible thing. Good luck my friend. Let us know how you come out.
Ok since you did all that if you want to swap around fuel injectors taking note where you put cylinder 1 injector. Lets say you swapped it with cylinder 4 . Now if you get a different code say P0304 which is for cylinder 4 misfire then you know it is your injector at fault. These are wear items and should be replaced every 100,000 miles.
Also i would suggest if you dont want to do that is get some good high octane gas when you are completely empty and fill to 1/4 tank now put in Lucas Oil fuel injector cleaner and run the car till empty. Now fill up tank with high octane gas in see if this helps. Clear code after your second tank of gas and see if the code comes back. if code does pop back up then i would do the swapping of injectors as i stated earlier. I hope this helps and good luck with the diagnosis.