Here is a pic of a schrader valve. They all look about the same.
If there isn't much pressure, cycle the ignition without turning the engine over and try again. If it is still weak, you may need a new fuel filter. If it is strong, you may have dirty or clogged fuel injectors.
It may be spark, but I'm inclined to think it is fuel related.
Good luck, and keep us in the loop!
JT
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