The most common problem for this symptom is that the fuel pump which has a
check valve in it is letting the gas drain back into the tank after you shut
it off. To prove this you can hook up a fuel pressure gauge to the test
port under the hood and see if the pressure slowly goes away. Another way
to check this condition is when you jump in to start it up cycle the key a
couple of times before you let it crank over. When you turn the key from
"off" to "run" the fuel pump is energized for about 2 seconds. You can
actually hear it if you are listening for it. By repeating this a couple of
times you are filling up the fuel line again. Then try to start it
normally. If it starts right up then the fix is to replace the fuel pump.
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