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If you spray fuel into the intake(50/50 test) and it doesn't start then no spark or no compression
If it has been sitting longer then 6 months then there is no "fuel" in the gas tank, its a liquid but no longer fuel, and that can cause a no start even when you manually add real fuel, old gas fouls the spark
After cranking the engine over, but NOT manually adding fuel
Pull out 1 spark plug
Its tip should be WET, if pump and injectors are working
Light the tip with a match/lighter
Should burn fast and bright, that's what gasoline does
If tip won't burn easily then "it ain't fuel in the tank", lol
If tip is DRY then injectors are not opening
If you think old fuel is fouling the system then pull the fuel pump fuse or fuel pump relay
Crank engine a few times, to drain pressure
Then try spraying in fuel manually to see if it starts
With key on CEL(check engine light) should come on, that means computer has booted up OK
When starter motor starts to turn the engine over the CEL should go OFF, that means the computer is getting a good Timing Pulse from the crank sensor
Computer has no connection to Starter Motor system
The only way computer knows you want to start the engine is when it sees a valid timing pulse from crank sensor
It will then start spark first, and then injectors a second later
Computers make things much easier
But a gasoline engine is still a gasoline engine
Needs 3 things to fire/start
Spark, at the right time
Fuel, mixed with air
Compression above 120psi
If you don't know why its been sitting then do a compression test on at least 2 cylinders, 3.0l expected is 165psi