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the best way to see if it is fuel problem.take a can of starting fluid and spray a small amount in the intake.(carb or throttle body) then try to start the car. if it fires you know you have power so i would suspect a fuel pump
check fuel pump fuse and relay also the fuel injection fuse and ecu fuse, if they are ok remove the back seat and you will see a cover remove the cover and check for voltage at the pump plug and ground, you hear the pump work if not need new pump
It drops when it is turned off through the return the pump might be getting weak If you keep using the starting fluid you will blow the intake off of it or it will get hooked on it and won't start without it.
Make sure the fuel pump is kicking on it won't hurt to check the relay but I have never seen one bad yet it could be the plug on the plug on the end of the wires that plugs on the pump this run hot and it burns the ends alot several fuel pumps are replaced because of this make sure you have power at the pump if you can't hear it run it will only stay powered for a few seconds and then kick off. so you might need someone to turn it on while someone checks the power.
Listen for the fuel pump prime cycle. Have someone listen back by the gas tank....turn the key after it has been off for at least 10 seconds to run position....you should hear a WHIRRRR for about a second or 2. If it is silent....you may need a fuel pump. Next give it a shot of starter fluid...if it starts on that...you indeed have a fuel problem.No start....no spark. If no start and you did hear a pump cycle....then it's most likely a no spark problem.......a common cause is the crank sensor and/or ignition module.